Add footer on pdf with pdflatex.

pdflatex-footer.tex

\documentclass{article}
\RequirePackage[a4paper,top=3cm,left=3cm,right=3cm,bottom=1.2cm]{geometry}

\usepackage{pdfpages}
\usepackage{fancyhdr}
\usepackage{lastpage}

\begin{document}

%% footer
\fancyfoot[RO]{AA 2016/2017 - pag. (\thepage/\pageref{LastPage})}
\fancyfoot[LO]{Programmazione B}
\fancyfoot[CO]{Luca Parolari}

%% header
\fancyhf{} % sets both header and footer to nothing
\renewcommand{\headrulewidth}{0pt}
%\fancyhead[LO]{}
%\fancyhead[RO]{\thepage}

\includepdf[pagecommand={\thispagestyle{fancy}},pages=1-]{x.pdf}

% set this style only to first page
%\includepdf[pagecommand={\thispagestyle{empty}},pages=1 ]{x.pdf}

\end{document}