/usr/share/doc/libwfmath-0.3-dev/changelog.Debian.gz is in libwfmath-0.3-dev 0.3.12-3ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libwfmath-0.3-dev/../libwfmath-0.3-6/changelog.Debian.gz