Malicious PDF — malware analysis report

Static analysis result for SHA-256 654a6731b25484a6…

MALICIOUS

PDF

183.8 KB Created: 2021-08-05 02:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a9a197386a6924313398484e556ed5a SHA-1: 8d92d54c2835fe4ee90ebd8d5991d02c30ab500c SHA-256: 654a6731b25484a69b5295691ba12c231976ae8e5736b6f8d73b811d764029d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious content, likely designed to lure users to malicious sites for phishing or further exploitation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to artificially boost search engine rankings for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9242

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://rc-modeller.se/images/file///mukasewunifupaxupozap.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4292e5dac87eb4243f75dd6a8d41eb7a/vaterageje.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/jilijemidukoroxof.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161099f788ac3a---zizenuxatepefekat.pdfIn PDF document text
    • http://short-story.ru/upload/file/93722462729.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cde5bbe291dc984f44b9f0c22a5cdd52/dikuvawuser.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/efd9ac93eb14b6fe299aaf49856f254c/2574635448.pdfIn PDF document text
    • https://emmaushuis.org/pages/38554805468.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f96ae35c2---98273949293.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/funaxajazut.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9909fe51---setewulasunujuwivika.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/89817161206.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xukibabivugedufoxa.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/banibilof.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kn6shvil4rcmocjfisg44c1k16/73235083241.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/lofevazuxe.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/670875409.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/94826059155.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/66415487186.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3f1980a0b236bca80450873c7994ec76/80919933873.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f991d9a2f2---lakuvebudasidimonapekuf.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/87518557898.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/bd5597d4e7bb951875a314c5eb83e0f3/93890774999.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/2122592740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=blood+on+the+river+summary+chapter+11PDF link annotation
    • 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_off0002bd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BD65 11164 bytes
SHA-256: a3ed191a1fa2bba4d5c0d48cb695a22af21b9cfb0882443ada3108e50790382d