Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7053a0b35746d5…

MALICIOUS

PDF

39.5 KB Created: 2021-06-15 21:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7dadbb0b166f6b9cedb6edcdff38b9c7 SHA-1: 65a158136d824e3233147a61890dbf1b44d168b4 SHA-256: 1d7053a0b35746d5f85833e0dd9ac3d5bc77b6312f94f4b06249a3fa47c7c9a1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9290

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://irlanc.ru/uplcv?utm_term=ejercicios+de+superlatives+and+comparatives PDF link annotation
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/78fc4500017001a18797ed8c1169bd5f/nusisodolovetix.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/09092be6fa0b0c7421505a2283d42def/72406787048.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160baae1c37c01---18923116762.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab4b63645de6699b5b51ca7486279f8a/nugufunasadam.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9f0eeb51---52282236978.pdfIn PDF document text
    • https://mfdesign.hu/files/file/86331918306.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1cirfosbrek4h00ic676vn6ou2/50381244811.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/20496207194.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/reguliw.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff63f6bda6---guliwifemibujamulumazam.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/40765136631.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/21367013988.pdfIn PDF document text

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