Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8f43f5779d5af6…

MALICIOUS

PDF

140.5 KB Created: 2021-06-19 23:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7df2071b0b59e7ae8b4cf4162cb578b9 SHA-1: ff93f3f320255aaae1a5ef0030aa78aa688f3456 SHA-256: 3c8f43f5779d5af67f315d86055aa80570af7f4ccfd4c4283f234fe0be8e4ac7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7104

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 https://synerhu.ru/uplcv?utm_term=lord+krishna+story+in+english+pdf PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65d126729---dejekiborotirejowafozugib.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/gebegijobeni.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c40d8c8a644ff9b3bc3f33b0bf74e1da/mowuworu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f58bea11029db0125905e5d6aa95bcfc/mabonenukasipopuvadenivoj.pdfIn PDF document text
    • https://kristinanamaste.eu/files/natozata.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae604fbb07a---18556402866.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/72020048985.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/e2dj2jkj4nvbd4ook85p0q0guq/24307850619.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/58118064702.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/02e477804a3d5eff2c5f178f22eb51a7/xaturoxef.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5069ebb95---pumofosamatiladuzal.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aa8fab9c647c6c200d5a5e045144fc48/mogivirutotavuwerakifom.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/d0e4eb5bb31f4540ad6491ffcf3851d6/53288250572.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1vqn5s757mv355h84n6c7ar850/bexamovadofeluwumif.pdfIn PDF document text
    • http://novichiha.ru/pic/file/88752215768.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/032fbf77996e97bec716aa5eebcd63b0/dimosubegufun.pdfIn PDF document text
    • https://dhesient.com/media/77042361349.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/47ov56o1comsvk9eob49873c06/76057292590.pdfIn PDF document text
    • http://scro.ru/pic/file/xasugufozizixalekewabaxok.pdfIn PDF document text

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