lib/texinputs/pdfsetup.sty

use darkblue for all links;

%%
%% Author: Markus Wenzel, TU Muenchen
%% License: GPL (GNU GENERAL PUBLIC LICENSE)
%%
%% smart url or hyperref setup
%%

\@ifundefined{pdfoutput}
{\usepackage{url}}
{\usepackage{color}\definecolor{darkblue}{rgb}{0,0,0.5}
  \usepackage[pdftex,a4paper,colorlinks=true,linkcolor=darkblue,citecolor=darkblue,filecolor=darkblue,pagecolor=darkblue,urlcolor=darkblue]{hyperref}
  \IfFileExists{thumbpdf.sty}{\usepackage{thumbpdf}}{}}