/usr/share/php/Horde/ is in php-horde-data 2.1.4-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/Data/
/usr/share/php/Horde/Data.php
/usr/share/php/Horde/Data/Base.php
/usr/share/php/Horde/Data/Csv.php
/usr/share/php/Horde/Data/Exception/
/usr/share/php/Horde/Data/Exception.php
/usr/share/php/Horde/Data/Exception/Charset.php
/usr/share/php/Horde/Data/Icalendar.php
/usr/share/php/Horde/Data/Imc.php
/usr/share/php/Horde/Data/Outlookcsv.php
/usr/share/php/Horde/Data/Storage/
/usr/share/php/Horde/Data/Storage.php
/usr/share/php/Horde/Data/Storage/Mock.php
/usr/share/php/Horde/Data/Translation.php
/usr/share/php/Horde/Data/Tsv.php
/usr/share/php/Horde/Data/Vcard.php
/usr/share/php/Horde/Data/Vnote.php
/usr/share/php/Horde/Data/Vtodo.php