/usr/lib/x86_64-linux-gnu/libqpdf.so.13 is in libqpdf13 5.1.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libqpdf.so.13.1.1
/usr/lib/x86_64-linux-gnu/libqpdf.so.13.1.1