/usr/lib/x86_64-linux-gnu/libpoppler-qt4.so.3 is in libpoppler-qt4-3 0.18.4-1ubuntu3.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpoppler-qt4.so.3.7.0
/usr/lib/x86_64-linux-gnu/libpoppler-qt4.so.3.7.0