/usr/share/php/Horde/ is in php-horde-log 2.1.3-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/Log/
/usr/share/php/Horde/Log.php
/usr/share/php/Horde/Log/Exception.php
/usr/share/php/Horde/Log/Filter/
/usr/share/php/Horde/Log/Filter.php
/usr/share/php/Horde/Log/Filter/Constraint.php
/usr/share/php/Horde/Log/Filter/ExactLevel.php
/usr/share/php/Horde/Log/Filter/Level.php
/usr/share/php/Horde/Log/Filter/Message.php
/usr/share/php/Horde/Log/Filter/Suppress.php
/usr/share/php/Horde/Log/Formatter/
/usr/share/php/Horde/Log/Formatter.php
/usr/share/php/Horde/Log/Formatter/Cli.php
/usr/share/php/Horde/Log/Formatter/Simple.php
/usr/share/php/Horde/Log/Formatter/Xml.php
/usr/share/php/Horde/Log/Handler/
/usr/share/php/Horde/Log/Handler/Base.php
/usr/share/php/Horde/Log/Handler/Cli.php
/usr/share/php/Horde/Log/Handler/Firebug.php
/usr/share/php/Horde/Log/Handler/Mock.php
/usr/share/php/Horde/Log/Handler/Null.php
/usr/share/php/Horde/Log/Handler/Scribe.php
/usr/share/php/Horde/Log/Handler/Stream.php
/usr/share/php/Horde/Log/Handler/Syslog.php
/usr/share/php/Horde/Log/Logger.php