/usr/lib/x86_64-linux-gnu/liblog4cplus.so is in liblog4cplus-dev 1.1.2-3.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liblog4cplus-1.1.so.9.0.0
/usr/lib/x86_64-linux-gnu/liblog4cplus-1.1.so.9.0.0