Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e4d6dca9bcdd3b…

MALICIOUS

PDF

74.3 KB Created: 2021-06-11 16:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367b37192f26209b3bdba33b9a2fdf4f SHA-1: 6b270583d7f5a6d8c2889fa7c69d418a4248623f SHA-256: e8e4d6dca9bcdd3bc5c6774284a7249ff2d808fcd6dc742feb4f7e011c7d7e27
176 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It leverages a link farm strategy, presenting itself as a search result for a medical dictionary to entice downloads. The embedded URLs point to compromised WordPress sites, suggesting an attempt to distribute further malicious content or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=download+dorland+medical+dictionary+pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853c5d5ce---90457340133.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/acb7ml3h4geu8j2qpol1jpjva0/60776273694.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a889aa1304f---vefuv.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c315362008375b8862ea71080213b064/98116678718.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5ae9caf7ef2fb1180d18fcec53149677/ridasidore.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160abfec7ba9a0---sikukabugozafu.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/42n49j4hnltg6alfoad6hdhjrv/3559871434.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d8ur2sm6nrsde6sgo6e4mpfkug/ganewa.pdf
    • http://acecaalcoy.com/userfiles/file/2717577244.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jt1lbqudn5nfk1u3gt0vc8182j/41683010675.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8fb5eae83---kidafokovefedofegux.pdf
    • http://accessiblevehicleservices.com/userfiles/file/gegexoju.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9345476e5edbc2d510251d78a99ec0b8/33870042915.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/78961230140.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c6.bin
2ee9e1a6f4fd35d7e39c29efb32025e4505f25e069175c9bc27aa0f27b9e58b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 5316 bytes
font_01_sfnt_off0000f6e7.bin
2f78a3752ddb7dc3c5e04cebec3860c8c6e5cd31742815040b0a56202dc7ecf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10940 bytes

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