/usr/lib/x86_64-linux-gnu/libpfm.so is in libpfm4-dev 4.5.0+git38-g1ca1338-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpfm.so.4.5.0
/usr/lib/x86_64-linux-gnu/libpfm.so.4.5.0