/usr/lib/x86_64-linux-gnu/libpoppler-cpp.so is in libpoppler-cpp-dev 0.24.5-2ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpoppler-cpp.so.0.2.0
/usr/lib/x86_64-linux-gnu/libpoppler-cpp.so.0.2.0