Malicious PDF — malware analysis report

Static analysis result for SHA-256 982d91e8cb81b5ab…

MALICIOUS

PDF

75.6 KB Created: 2021-07-14 09:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8ac57cb3b2aa59f7121d8dec86c8c262 SHA-1: 9e3edfd718dc0c60dbe4f4da857fad83e73bf3d7 SHA-256: 982d91e8cb81b5ab43602e79465f25a7ac7e9f945773ce5cb6e87a8bbdc6373a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7448

Heuristics 4

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=glorious+things+of+you+are+spoken+lyrics PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3hm1lgk0cjg6ccjruvbeq7d302/ritulitazotezesojoji.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/53c9bft32bms1cj14duqe3rq3c/netasobakof.pdfIn PDF document text
    • http://4bx.pl/public/file/fipezimapakalosamopaka.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/kenenep.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b713696dc8---zunip.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/wigowupimukoxekuxibasusu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n4mspqo4avlc4p7to6ighvkjtl/39954629753.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/33ck308ocbuchk229t542ikp30/rutunu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aade4bda629---41260404228.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/xutilajifalefupikorogujef.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d514903088d---22536823200.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/litagikifu.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/20802963164.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/xijofowubu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba8a43410---30935864227.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/87248130326.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/66279112456.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///62235655212.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ulgmehombb9s55jtr9q31sj3o6/61711029921.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1359709ee579141d26bb775602e94e95/gifurosugabugixaxifufina.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/43914599740.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9763013d59089267d83b0b0a97fb4080/4562550861.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/86d67db0b9cf9257963768b721d384bc/sepemanuvunaj.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60824499003.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb6c57ffe---fidamevamufugedirewud.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 17872 bytes
SHA-256: f75e81db0580d5d9631091f4d3b9873d9c8563cd1fa0025857ea8e0c336291c5