Malicious PDF — malware analysis report

Static analysis result for SHA-256 926d1519c2b26dd9…

MALICIOUS

PDF

62.5 KB Created: 2021-06-12 23:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d40284975249085146878e222d8cf850 SHA-1: d2845371b796a7efc5097fcf029ced53e599c7a6 SHA-256: 926d1519c2b26dd9ec878d8cc05ed568bf2c74d66d495d2604bb62a1b2e719d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7500

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://crewmak.ru/uplcv?utm_term=fundamental+of+nursing+pdf+book
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0be39f994---jajipekaralepe.pdf
    • http://samuiluxurytravel.com/Uploads/file/losanugufo.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe71c190e---70367739148.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092161b2809d---binel.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070d110784a3---visejiw.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/genofivamuporujedo.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67964ec26---kolizepodabozelu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb1cb0e85---52189254918.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc21dbefbf---nuwuvumipupifevetenukela.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/h3sfjthdvt8u76sbl96uhfgvmb/76266883861.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce059b1bb---54628146745.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5b8b64fd5ac582d51bbc17e0f388a34a/68683678408.pdf
    • https://arvikabc.com/images/uploadedimages/file/33007550762.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o9i37mpibbq7vd3phhaqv0ji40/towipagorafodaba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7a.bin
e7063561e58e5680831c10af5c36582b167cb1e0cd4e789972d38a75eec3eb40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 5520 bytes

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