/usr/share/pam/common-auth.md5sums is in libpam-runtime 1.1.8-3.2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 | 933d757dcd5974b00619f68955743be7  /etc/pam.d/common-auth
b58d8e0a6cadbf879df94869cca6be98  /etc/pam.d/common-auth
8d4fe17e66ba25de16a117035d1396aa	# 1.0.1-6 -
 |