/usr/share/man/man1/snmpinform.1.gz is in snmp 5.7.2~dfsg-8.1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/snmptrap.1.gz
/usr/share/man/man1/snmptrap.1.gz