Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf7d037d7ff25f4…

MALICIOUS

PDF

76.6 KB Created: 2021-06-09 04:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5d13094eccc72adccafcbd4cd3f7d56b SHA-1: c6c887f53650f2350842278b94d08dd75258cae9 SHA-256: 8cf7d037d7ff25f4ef898fb6574f09057a3704fbd8b7e97f945c85580247ce44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The document body, though heavily garbled, suggests a lure related to learning English, likely to trick users into visiting these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://crysiq.ru/uplcv?utm_term=escuelas+para+aprender+ingl%25C3%25A9s+cerca+de+m%25C3%25AD PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074444c4cf41---23312172483.pdfIn PDF document text
    • https://seerupit.dk/assens/file/ribon.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/egnlr5b7l9nui8lpfe51aiecfa/xuruzupujowe.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2c2337e159accc141ceaa6aebecaa569/58524619429.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d025ee37dfaed79b3af53e6f0957f5d2/60446268096.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/73521182976.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16098c268b79c7---59336117532.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/70317309734.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file/%5C/zupabibatanokusutozemo.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4125dccb4d---41952349693.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/31958145973.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6199478b0deeb3b57f1afd1e89c42d4e/46134303549.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/52385133842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5544 bytes
SHA-256: 1c3effa0997a9168a2e471168bb44456e3934e4bee0f78461c275f0db8b9dc75
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 12404 bytes
SHA-256: 9597252dfd2efd3be13c3c021bdd102550a0d9084c22b1f573c4db2e086430f8

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