/usr/lib/x86_64-linux-gnu/libhdf5_mpich_fortran.so.8 is in libhdf5-mpich-8 1.8.13+docs-15+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libhdf5_mpich_fortran.so.8.0.2