/usr/share/perl5/Log/Log4perl/Appender/ is in liblog-log4perl-perl 1.41-1.1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Log/Log4perl/Appender/Buffer.pm
/usr/share/perl5/Log/Log4perl/Appender/DBI.pm
/usr/share/perl5/Log/Log4perl/Appender/File.pm
/usr/share/perl5/Log/Log4perl/Appender/Limit.pm
/usr/share/perl5/Log/Log4perl/Appender/RRDs.pm
/usr/share/perl5/Log/Log4perl/Appender/Screen.pm
/usr/share/perl5/Log/Log4perl/Appender/ScreenColoredLevels.pm
/usr/share/perl5/Log/Log4perl/Appender/Socket.pm
/usr/share/perl5/Log/Log4perl/Appender/String.pm
/usr/share/perl5/Log/Log4perl/Appender/Synchronized.pm
/usr/share/perl5/Log/Log4perl/Appender/TestArrayBuffer.pm
/usr/share/perl5/Log/Log4perl/Appender/TestBuffer.pm
/usr/share/perl5/Log/Log4perl/Appender/TestFileCreeper.pm