Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f34a79c36472d5…

MALICIOUS

PDF

63.8 KB Created: 2021-05-20 22:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c48d9ce911544a2d40ab71942dfac3ec SHA-1: daacc5d01b1afdfa234c69267edb760efe94f90d SHA-256: e1f34a79c36472d57871af9128c0e13129295f06dbe5c93c2f2558792e4674d4
154 Risk Score

Malware Insights

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

This PDF document is classified as malicious, likely a phishing or trojan delivery mechanism. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to host and distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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 http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d7p7eqoe4vrq9jd5ncfvn82v77/7348481550.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8e0f2e603d81190eda6fe3a5f4a55252/9174106247.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/82235738810.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba87285234---20159146743.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4c7a605e---87043886739.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8e920bf8---gibibefi.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c57677fdb2---pamevukijo.pdf
    • https://imagebeaute.fr/userfiles/file/50577562525.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bgv6osjfj4rj4l0gd672857da4/25642856492.pdf
    • http://adamlegal.com/userfiles/file/zibelijerewin.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ce9204ce---79680784192.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3a5e804a61eb7d64a1877df4936d26c2/76131699217.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ec4ec5f---27621945071.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa9703fa4---78544585973.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c447588c52---supujaziko.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05dfc181d7---40679335116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+prepare+for+a+group+case+interview
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91e.bin
dee70333f838d6aba9f73d7dace8e0d6e556592c4dd8be9304f33560b672538a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5264 bytes

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