/usr/share/php/Horde/ is in php-horde-xml-wbxml 2.0.3-3ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/Xml/
/usr/share/php/Horde/Xml/Wbxml/
/usr/share/php/Horde/Xml/Wbxml.php
/usr/share/php/Horde/Xml/Wbxml/ContentHandler.php
/usr/share/php/Horde/Xml/Wbxml/Decoder.php
/usr/share/php/Horde/Xml/Wbxml/Dtd/
/usr/share/php/Horde/Xml/Wbxml/Dtd.php
/usr/share/php/Horde/Xml/Wbxml/Dtd/SyncMl.php
/usr/share/php/Horde/Xml/Wbxml/Dtd/SyncMlDevInf.php
/usr/share/php/Horde/Xml/Wbxml/Dtd/SyncMlMetInf.php
/usr/share/php/Horde/Xml/Wbxml/DtdManager.php
/usr/share/php/Horde/Xml/Wbxml/Encoder.php
/usr/share/php/Horde/Xml/Wbxml/Exception.php
/usr/share/php/Horde/Xml/Wbxml/HashTable.php
/usr/share/php/Horde/Xml/Wbxml/LifoQueue.php