Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5634918fdc07420…

MALICIOUS

PDF

93.8 KB Created: 2021-08-24 05:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d1757196a030d0073768cafdaf286bb SHA-1: 3c69c466c90c2bc21d405951fa6787fbec95f4d2 SHA-256: e5634918fdc0742016d3340ee11a67ba83f3757582aa0291b2eaa0f7f86e255c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9229

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ea0283d2991d991c7b1442d0192a977e/vuvowubiwotopasa.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160811e83dc528---75551453767.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6694d9afc5cf84c7f97d466bf192e3a3/39952256230.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/vajiribitigubepiwavos.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb275db7f---19789282949.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/99529446875.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/latamuz.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/78253058303.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/jakix.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/zorejabum.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nasebogewebuzakopalopigo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/58f3fdc5565b9afde09f2ebca9caae64/romixumukazurilibosodu.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xuvekupipule.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c16c952ba---80686804241.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fbgl73ubjejlrv016c24jfst61/23149939038.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vvts0t3d6p8kq5vd60tiesquh4/fevunavitepapik.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67311503637.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/996da761651d3f21916f204326d99270/nixulab.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/9791695540.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/roxod.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25baca85e4---514028395.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5952e96488db661b2a6e6fcc4fc436b4/16286935768.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/temesulizogugusurulefuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+soil+does+aloe+vera+needPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 17076 bytes
SHA-256: 9d9508ba9c45c086191c640d15ce616d16cff51faf2fc170684bc5cc305ebb71
font_01_sfnt_off000145a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A1 10404 bytes
SHA-256: 2aef542d632c377ea9083851239cf4d73d7e815f0150a873c19f5f42ecf68ae0
font_02_sfnt_off00015d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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