\documentclass[]{article}
\usepackage{pdfpages}
\usepackage{hyperref}
\begin{document}
\tableofcontents
\includepdf[pages=1-3,
  nup=1x3,
  frame=true,
  addtotoc={1,section,1,{TOC-Eintrag 1},teil1}
  ]{beamer01.pdf}
\includepdf[pages=4-6,
  nup=1x3,
  frame=true,
  addtotoc={4,section,1,{TOC-Eintrag 2},teil2}
  ]{beamer01.pdf}
\end{document}