Because you gave no complete MWE I used simply an example of an CV included with moderncv
class.
The following is simply a bad and dirty hack (because it is not easy to change the complex code producing the title of the CV): I use simply \extrainfo{...}
you did not use in the given code snippet and add there as many lines as needed writen in white textcolor like:
\extrainfo{\textcolor{white}{additional information} \\ % <=============
\textcolor{white}{additional information} \\ % <======================
\textcolor{white}{additional information} \\
\textcolor{white}{additional information} \\
\textcolor{white}{additional information }} % <=======================
That depends on the image you are using. I needed five lines because I used example image example-image-golden-upright
from package mwe
(must be installed but not called!). Just play with the number of used lines in your case ...
With the following complete TeX code:
\documentclass[11pt,a4paper,sans]{moderncv}
\moderncvstyle{classic} % head 1, body 1, foot -
\moderncvcolor{blue}
\usepackage[utf8]{inputenc}
\usepackage[%
scale=0.75,
top=0.5cm, bottom=1cm
]{geometry}
\usepackage[export]{adjustbox}
%\setlength{\hintscolumnwidth}{2.5cm}
\name{John}{Doe}
\title{Resumé title}
%\address{street and number}{postcode city}{country}
\phone[mobile]{+1~(234)~567~890}
%\phone[fixed]{+2~(345)~678~901}
%\phone[fax]{+3~(456)~789~012}
\email{[email protected]}
%\homepage{www.johndoe.com}
\social[linkedin]{john.doe}
\social[twitter]{jdoe}
%\social[github]{jdoe}
\extrainfo{\textcolor{white}{additional information} \\ % <=============
\textcolor{white}{additional information} \\ % <======================
\textcolor{white}{additional information} \\
\textcolor{white}{additional information} \\
\textcolor{white}{additional information }} % <=======================
\photo[64pt][0.4pt]{example-image-golden-upright}%
\quote{Some quote}
\makeatletter\renewcommand*{\bibliographyitemlabel}{\@biblabel{\arabic{enumiv}}}\makeatother
%\renewcommand{\refname}{Articles}
\setlength{\footskip}{66pt}
\begin{document}
\makecvtitle
\section{Education}
\cventry{year--year}{Degree}{Institution--3}{City--4}{\textit{Grade}--5}{Description--6} % arguments 3 to 6 can be left empty
\cventry{year--year}{Degree}{Institution}{City}{\textit{Grade}}{Description}
\section{Master thesis}
\cvitem{title}{\emph{Title}}
\cvitem{supervisors}{Supervisors}
\cvitem{description}{Short thesis abstract}
\section{Experience}
\subsection{Vocational}
\cventry{year--year}{Job title}{Employer}{City}{}{General description
no longer than 1--2 lines.\newline{}%
Detailed achievements:%
\begin{itemize}%
\item Achievement 1;
\item Achievement 2, with sub-achievements:
\begin{itemize}%
\item Sub-achievement (a);
\item Sub-achievement (b), with sub-sub-achievements (don't do this!);
\begin{itemize}
\item Sub-sub-achievement i;
\item Sub-sub-achievement ii;
\item Sub-sub-achievement iii;
\end{itemize}
\item Sub-achievement (c);
\end{itemize}
\item Achievement 3.
\end{itemize}}
\cventry{year--year}{Job title}{Employer}{City}{}{Description
line 1\newline{}Description line 2}
\subsection{Miscellaneous}
\cventry{year--year}{Job title}{Employer}{City}{}{Description}
\section{Languages}
\cvitemwithcomment{Language 1}{Skill level}{Comment}
\cvitemwithcomment{\textbf{Language} 2}{\textbf{Skill} level}{Comment}
\cvitemwithcomment{Language 3}{Skill level}{Comment}
\section{Computer skills}
\cvdoubleitem{category 1}{XXX, YYY, ZZZ}{category 4}{XXX, YYY, ZZZ}
\cvdoubleitem{category 2}{XXX, YYY, ZZZ}{category 5}{XXX, YYY, ZZZ}
\cvdoubleitem{category 3}{XXX, YYY, ZZZ}{category 6}{XXX, YYY, ZZZ}
\section{Interests}
\cvitem{hobby 1}{Description}
\cvitem{hobby 2}{Description}
\cvitem{hobby 3}{Description}
\section{Extra 1}
\cvlistitem{Item 1}
\cvlistitem{Item 2}
\cvlistitem{Item 3. This item is particularly long and therefore
normally spans over several lines. Did you notice the indentation
when the line wraps?}
\section{Extra 2}
\cvlistdoubleitem{Item 1}{Item 4}
\cvlistdoubleitem{Item 2}{Item 5}
\cvlistdoubleitem{Item 3}{Item 6. Like item 3 in the single column list before, this item is particularly long to wrap over several lines.}
\section{References}
\begin{cvcolumns}
\cvcolumn{Category 1}{\begin{itemize}\item Person 1\item Person 2\item Person 3\end{itemize}}
\cvcolumn{Category 2}{Amongst others:\begin{itemize}\item Person 1, and\item Person 2\end{itemize}(more upon request)}
\cvcolumn[0.5]{All the rest \& some more}{\textit{That} person, and \textbf{those} also (all available upon request).}
\end{cvcolumns}
\end{document}
I get the following resulting pdf (as wished):

As you can see (long red arrow) the additional information is there (needs the marked place), but it is not visible, because it is printed in white color ...