/usr/share/php/ is in libphp-phpmailer 5.1-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/libphp-phpmailer/
/usr/share/php/libphp-phpmailer/class.phpmailer.php
/usr/share/php/libphp-phpmailer/class.smtp.php
/usr/share/php/libphp-phpmailer/class.pop3.php
/usr/share/php/libphp-phpmailer/language/
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-zh.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-hu.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-zh_cn.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-it.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-fr.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ja.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-no.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-fi.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-br.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-dk.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ar.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-nl.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-de.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-es.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-cz.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ru.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-tr.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-pl.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-fo.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ch.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ro.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-et.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-se.php
/usr/share/php/libphp-phpmailer/language/phpmailer.lang-ca.php