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KPDF is part of the kdegraphics package of KDE 3.

In case you want to get the lastest stable source code you can grab the kdegraphics package at ftp://ftp.kde.org/pub/kde/stable/3.5.10/src

If you want to get the code from the KDE subversion repository, use /branches/KDE/3.5/kdegraphics/kpdf/

KPDF is not developed anymore, if you want to develop new features you should have a look at Okular, that is the succesor of KPDF in KDE 4.