\documentclass[12pt]{article}

\usepackage{geometry}
\usepackage{tikz}
\usepackage{xcolor}

\definecolor{orange}{HTML}{FFEACB}

\def\dotfill#1{\cleaders\hbox to #1{.}\hfill}
\newcommand\dotline[2][.5em]{\leavevmode\hbox to #2{\dotfill{#1}\hfil}}

\geometry{
    paperwidth=7.6cm,
    paperheight=10.7cm,
    landscape,
    left=5mm,
    top=2mm,
    right=5mm,
    bottom=5mm
}

\pagenumbering{gobble}


\begin{document}

\pagecolor{orange}

\tikz[remember picture,overlay] \node[opacity=1,inner sep=0pt] at (1.4, -1.6){
    \includegraphics[height=.6\paperheight]{flagge.jpg}
};

\tikz[remember picture,overlay] \node[opacity=1,inner sep=0pt,anchor=west] at (5.3, -0.1){
    ID: \dotline{2.5cm}
};

\tikz[remember picture,overlay] \node[opacity=1,inner sep=0pt] at (7.1, -2.4){
    \tikz{\draw (0,0) rectangle (35mm, 45mm)}
};

%\begin{minipage}[t]{0.7\textwidth}
%\vspace{0pt}

%\end{minipage}
%\begin{minipage}[t]{0.3\textwidth}
%\vspace{0pt}
%\includegraphics[height=1.5cm]{wappen.jpg}
%\end{minipage}

\vspace{14mm}

\begin{minipage}[t]{0.55\textwidth}

\vspace{2mm}

\tiny{Name}

\vspace{4mm}
\dotline{4cm}
\vspace{2mm}

\tiny{Klasse}

\vspace{4mm}
\dotline{4cm}
\vspace{2mm}

\tiny{Unterschrift}

\vspace{4mm}
\dotline{4cm}
\vspace{2mm}

\end{minipage}

\end{document}