Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4b3329d935a94f…

MALICIOUS

PDF

67.9 KB Created: 2021-06-23 20:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e537a369e713017b9586d220a37d5317 SHA-1: 9426d26f8441d535514c0b7e64ac983f66067e89 SHA-256: 5a4b3329d935a94fe12c3c463fceb75cb8e19773bf81b1764e91e9f10ff18b2a
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/43c83b996aacf80126d76b98fe06a37a/33029381920.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3f4d8216---womodobesasekawog.pdfIn PDF document text
    • http://beiks.info/public/file/36840547500.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c880c3ba---milip.pdfIn PDF document text
    • http://jfe.hk/userfiles/waluwekamonojetemofopoge.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/72982284138.pdfIn PDF document text
    • https://agermag.ro/mm/file/vabekile.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/575e47b119cf5f8a0e447d6e71374b67/fariwuxam.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720a3ed70ec---70791073498.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d25a5851---bitefad.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/24383306009.pdfIn PDF document text
    • http://minipit.com/data/files/6929718265.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/46c9brd7gf7h02ah204342c57r/pufalevevaxowiwutotizi.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fupowafowuxo.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/kilozubixezonokakixeb.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/repusubupenaxojederawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=block+craft+3d+gems+hackPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 5348 bytes
SHA-256: c09ff3e19dd673f6465499a6d950a52e75da3054b43f7b258268b63f403c02b0

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