Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a10459922b1f8f6…

MALICIOUS

PDF

39.0 KB Created: 2021-06-28 22:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 688ac304e276602d449ddf8ff6fd1ce9 SHA-1: b2b42cbb186f1f55c83b08fc93c29fbb861e7200 SHA-256: 3a10459922b1f8f64af43d47953571f9441ba5a0975ddbd60a6a67e1f1a04ebb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely designed to trick users into clicking on embedded links. The document contains numerous external URIs pointing to various domains, many of which appear to be compromised CMS uploads, suggesting a distribution network for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=optical+coherence+tomography+angiography PDF link annotation
    • http://beveragesgs.com/userfiles/file/ruzepegufido.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/76133408806.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c39554933e9---bitumegadutelov.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8b3e00ee7ed83a5b067da129d16a0551/17543712882.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/13982617389.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mm719ic3sc7m1nc79pcbogk60j/kedixevifuko.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb4d1bc06---20824220566.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n9h15ie352d2u56j1ul96mmjjg/10352843463.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8f1b2802bd970fd33605a05413aafa60/guwuzidegimomexi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d9jmkvh9ucuohlraojumiucmiv/59910568372.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/jugabik.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/11847690977.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca32b3b7f5---xuxexagefa.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/183349dbe150ccaed7fb630514e1e6de/72858433815.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/tiponozuxevizagoroxibeto.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcrafIn PDF document text

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