Пользовательское свойство раздела на детальной странице товара

 CModule::IncludeModule("iblock");
                        $db_list = CIBlockSection::GetList(array(), ['IBLOCK_ID'=> /*ваш iblock_id*/], false, ["UF_SERTIFICAT"]);
                        while($res = $db_list->GetNext())
                        {

                            foreach ($res["UF_SERTIFICAT"] as $key):

                                $SERTFILE = CFile::GetFileArray($key);?>

                               <a href="<?echo ($SERTFILE["SRC"]);?>"</a>
<?
                            endforeach;
                        }

?>