Malicious PDF — malware analysis report

Static analysis result for SHA-256 6531494063fdcf45…

MALICIOUS

PDF

62.5 KB Created: 2021-06-01 09:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba76c2759a3210c1a95ab03896eaada SHA-1: 50e90611c6c4d8498a6b028c9acdcdd13864d5b4 SHA-256: 6531494063fdcf45957dfa43e5fa547aad79e1d634203858a9b50d44515be280
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5c31ea204ef05bb996137db753a652cb/71633445904.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160850abf47400---sasenonopafug.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/363d7e609084ee105bd3ea2599c73dcf/pegawuduvidorutibewajezul.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/70e077590653f36f236e374309a1ac99/juvejosefunegore.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9460d7e8---76498669285.pdf
    • http://afghansolar.com/userfiles/file/85851677818.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d9604fb---sozivimel.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/d4bfgf1qj9031bf5l1128q66un/12142728160.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/18253951647.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1c5afaca46429acfc8146e798ee9d222/joforurutuje.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6b102a6e2a6e2d5dd08f66125b5b6f4f/54621203293.pdf
    • https://deltagroup.bg/uploads/file/58877723413.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a43480b01da2486e6f0b6c9e59a1b1ae/60515634181.pdf
    • http://jucal.es/images/file/wojedetuv.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc5da65f58---pajafawisatulexi.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fcae81792---557532221.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0cd0539f8---darorugenigatimop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=afrikaans+dictionary+free+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3be.bin
0fc1a2c2fabad42891a25c4a5995e0e848056ba5faae5f45158780a06f4d3ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 5272 bytes

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