/usr/share/pam/common-password.md5sums is in libpam-runtime 1.1.8-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | 601ecfbc99fd359877552cb5298087ad /etc/pam.d/common-password
e5ae8ba8d00083c922d9d82a0432ef78 /etc/pam.d/common-password
5d518818f1c6c369040b782f7852f53e /etc/pam.d/common-password
9ba753d0824276b44bcadfee1f87b6bc # 1.0.1-4ubuntu5 - 1.0.1-4ubuntu5.5
4bd7610f2e85f8ddaef79c7db7cb49eb # 1.0.1-6 - 1.1.0-1
50fce2113dfda83ac8bdd5a6e706caec # 1.0.1-6ubuntu1 -
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