Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7613a878b4b188d…

MALICIOUS

PDF

82.9 KB Created: 2021-06-05 15:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d1c0c68bb4d219c77e33dc658770e3 SHA-1: 45f8d5e0bfd3dddc4689fec04a140b528b2bc9c8 SHA-256: d7613a878b4b188ded7f44ae014d14cc7a3dabb2d637e140ada63f5df5332a8a
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards a phishing campaign that uses a seemingly legitimate document to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7802

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=class+12+chemistry+practical+book+pdf+download+state+board
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f500aae1a6---12218014128.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/fc190b2983b00691566d4aaf75998a91/59255032421.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/91990ca302a249e2b46073234b9f2aa9/fazisepima.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076db63895b2---jigelujiwugatomutuf.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160794fddb5d1c---dibababirixevubojarula.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1864de14---xapusaduxe.pdf
    • http://www.asap-recruitment.net/upload/file/pokam.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tiv2lc15g3d9uev8bfdcfrj8b4/vovinibafeludag.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ac7d0f34---tibizumubifejako.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3ff0c79c---89583840679.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4d62cf06b5d907362c569b188d331f8c/21816265049.pdf
    • https://loctra.net/userfiles/file/52174625468.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084f70e3badc---migefunagekobolegewokino.pdf
    • https://contactfm.be/userfiles/files/74077303854.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4404e65d6---49125229612.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_off00011581.bin
337ed20fd30b31d14e068f668c9f5e942140577fe7c3211180bcbab951d6d038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 5880 bytes
font_01_sfnt_off00012972.bin
64bcb19e2e235bbae35d8434fbd4107a37a4a257576994a773e9cef1c13dc30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 11168 bytes

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