Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b25d507997ec5bd…

MALICIOUS

PDF

39.6 KB Created: 2021-06-21 12:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 288a1be5c641c76f56d4684fb98ea86b SHA-1: f7fbe4d220a51dd30a241a36909da289a47414cd SHA-256: 2b25d507997ec5bd3cbd32577c009ca85a3d9fe40b192622a55a049cbddac752
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 0.8415

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://chcial.ru/uplcv?utm_term=english+conversation+questions+pdf PDF link annotation
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rv4q1aur67kl16rdh0msfdr4ra/77682114475.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/mixizufitageg.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf43f81ccd1---noxutejujulefuxibiwivi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7e707d0f5eb81a671d6f00c8448f9c55/jifodopepalurexeg.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb90d6e0d0---88230054553.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b12cfeba9876b6789d7356d83717b2da/56686787067.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/91720406171.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/vogebosos.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/373b749011dcabdb045f34b66371c5ba/zegufexi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c53d26076acb06d77a85c72e9bf719a6/85099990901.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/tulofowumitigesalama.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/xekividibufafaxixod.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/didulufodiwiped.pdfIn PDF document text

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