This file is indexed.

/etc/pam.d/ftp is in inetutils-ftpd 2:1.9.4-2+b1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Standard behaviour for ftpd(8).
auth	required	pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed

# This line is required by ftpd(8).
auth	sufficient	pam_ftp.so

# Standard blurb.
@include common-account
@include common-session

@include common-auth
auth	required	pam_shells.so