Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd9b92fc59ef32a…

MALICIOUS

PDF

69.2 KB Created: 2021-06-13 18:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8aaf08738bbff4d2c8a40703d6786b5c SHA-1: 81417c4eb6bd5eba17b25af9d16946c7a22d0d7e SHA-256: 4bd9b92fc59ef32abc8e0cdeffedbabc454a61da086164e9d1f66b0c81a18749
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier indicate malicious content. The document body, though heavily obfuscated, contains text related to downloading 'Audition 1.5', likely a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7986

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://medvor.ru/uplcv?utm_term=audition+1.5+descargar PDF link annotation
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2978c98dec---lipemilidexutalivetufuwu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e358e3b9c7---1786036140.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/40636525960.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d70947755---7339073044.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/504d377789d09f5e6c7cfe1d7eba4b60/7509179636.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b38c7530de3f690440076671f921dd7/44265615115.pdfIn PDF document text
    • https://argumentua.com/i/file/98055075068.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2d66d61e---nuragujerimobalemavefito.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/42949620186.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/71dd8fe2c53f45ddcba95997379e30a7/63112792992.pdfIn PDF document text
    • http://unsersohn.ch/images/file/melawenividovapubije.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/u77eqelil57g3ook0jood4iv4m/webivomajapobikefubuwebi.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/1774693289.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ig9g3osh3gn0nutgoq63c54ss5/58645175329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 5272 bytes
SHA-256: 188838b2ec130e6d058aebfb698e7f2f06414298e061398ea08a1c40e15b046b

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