Malicious PDF — malware analysis report

Static analysis result for SHA-256 d519ac3597786c4d…

MALICIOUS

PDF

66.5 KB Created: 2021-06-09 02:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba8e55b9cb6f812f66d872768cb52e6b SHA-1: deb0223825617ab872ae486e328c6db0e92a02c7 SHA-256: d519ac3597786c4dc6e9f429d25078111787fc06987b1a60be8d2ef234449102
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body's reference to 'mp3 audio recorder for pc' combined with the URLs suggests a lure to download potentially malicious software or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9005

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://nomylo.ru/uplcv?utm_term=mp3+audio+recorder+for+pc
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609111a8613ab---95395600003.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609332926788a---88143388734.pdf
    • http://adamlegal.com/userfiles/file/37614692462.pdf
    • http://eko-inwest.eu/upload/file/muxejekulovige.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b3ed2c4517e7331c65cef38e7b716666/jumefozavelumufef.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d8c871875c8e79b277e80c383b1d59eb/dufosusumuk.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53e3aaf66---fozexo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/65a3313c7a0089f304577a351ee4d727/89427810416.pdf
    • http://agcslohian.com/userfiles/file/gamegizofexutafu.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/jixisaveduwi.pdf
    • http://hanboo.cn/Uploads/file/2021051222325270554.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6edd6553---dedekitipomelevuvominosal.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/7n347hi5th9q1l32lrniom7va5/99882891352.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0fb07eea5f5099d58afcc527a62fd189/gupipigu.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35b5ed5f62---ganorufarolefufamepel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca0.bin
019cb412a8d249b031fe824e8d215c28e11b86fe64e583dc89265165e014128f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 4804 bytes
font_01_sfnt_off0000ed0d.bin
108cabfc09d31d21de782a8235afea60272859fe17ebd425fa53637fefdf81dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 10516 bytes

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