Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8da1cd885b1b6e3…

MALICIOUS

PDF

63.7 KB Created: 2021-06-04 22:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de9a4442f5cdcff3c91758c322391f4c SHA-1: f9795500954d1fb0d37945632edb514ac4c1bbbd SHA-256: c8da1cd885b1b6e343e5cd4eb3ad4ce4a0fe885c7c74b892192df4cf502d59fe
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=iso+guide+73+risk+management+vocabulary+pdf PDF link annotation
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/g2ljc4uv6pubbr9186guf2l20r/50052821773.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/nugan.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/76d020a182fec91aef933d458b76abc5/niwizadanemajek.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753c74c377---35627264850.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae9830d13---46613843339.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b257825154---31833794742.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7ec0a06d70b25774b144527020b7225f/25391898711.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/87bd7f545600e88413123c4f48451ce0/fokuraxejudopalukobes.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f453e72871---21590891291.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/59097663271.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6973e8e47788b28affa83f3289140f58/6666719481.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/17992660146.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/dalenovodejebivuxovow.pdfIn PDF document text
    • https://inifd.london/uploads/file/fodabafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 6024 bytes
SHA-256: 0c3aedafc82c3181b4e32b28c20061e23fc5525efcc5358bc66593da73547b52

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