/usr/lib/x86_64-linux-gnu/libpoppler-qt4.so.4 is in libpoppler-qt4-4 0.24.5-2ubuntu4.17.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpoppler-qt4.so.4.3.0
/usr/lib/x86_64-linux-gnu/libpoppler-qt4.so.4.3.0