Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdb3d483449e0b8…

MALICIOUS

PDF

63.9 KB Created: 2021-05-21 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98c14e3fe896b62a88a4cdc612dcab70 SHA-1: 89748e91e698abb1831af3ef0fe9715545c0c883 SHA-256: 7bdb3d483449e0b8f28bdc683fe39245bbf6afb1bc221a94c3c41f03f8ca263f
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or scam campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/33d14ff1328062ff1daf605f9497bf5a/46327903379.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/f8us170l5s7k3th935rcfpak19/vexumasavonudadagiwalosat.pdf
    • http://backupcenters.com/userfiles/file/salerafejedadewomirinup.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092779648258---fofarurunapubo.pdf
    • https://soudurelausiere.ca/upload/editor/file/nukagogole.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59ba0cd1a---46339576603.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/79cd53aa64dcd3d5eacd0436c34d9ffc/jajovufes.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f4c30f5b463f6a349e104717fd815b36/texip.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad374bee8---gidajejarinorisiz.pdf
    • http://applexin.com/ttpsea/files/file/95176849508.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a024abeb87---10148122515.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd64b23778---60740778775.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bb1baa2800ad9b5a096a0b86051f9b0e/7271990825.pdf
    • http://grawerlik.pl/userfiles/file/midozavadoxoberepos.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vinpna2assk1cb73sdghcgvaiq/vagipenojegofiregi.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6842dd682d3aa19287ac5bb82927a944/ruzawaruniwagizemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+is+an+international+stamp+worth
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d673.bin
9b081ae7a02821140f0731ce5c0da37b08fe762c982fa56037f55bb2db8d82ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 5108 bytes

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