Malicious PDF — malware analysis report

Static analysis result for SHA-256 6376c9c9158f9d39…

MALICIOUS

PDF

84.7 KB Created: 2021-07-05 14:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a7b3e4e4c87cc1d70939dfb62ae100b SHA-1: e2f8291d82eeea82c675bb44180b707a63aac403 SHA-256: 6376c9c9158f9d3960f8e2421a95043f4ffe6fbd1c697108054dd09ab006f648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to leverage these sites for hosting or redirecting users to malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely for SEO poisoning or to obscure the true destination of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://otartufo.com/ckfinder/tartufofiles/files/66580226606.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f6fa9ccd412ba671b84b1cfcfbe231b5/mexadivefetefuzuse.pdf
    • http://www.vljainandco.com/userfiles/files/37976675480.pdf
    • http://serdceprirody.ru/userfiles/file/56018235447.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5ccb7cd1a88f53cbf006c920fb0bfe71/woxidekatudufe.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/48ed7d86a738a0a3c8832ca95ab88f18/93833163498.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ed7e6060064f212d5af594c854a204b7/27870558032.pdf
    • https://jakspravnenapsa.cz/userfiles/file/gegopupixunozowazumizuxu.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/198d76ff3b559e6f8969886cc7eb3d6c/75549157535.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731d8d67d7e---veposatugaxan.pdf
    • http://extintoresorigen.com/images/editor/bujovaxanivewakavoforaba.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8142c825---13298732786.pdf
    • http://mixmarketing.vn/upload/fck/file/vupogu.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b65101e21b936c3a44ea572799b31f95/watovobiwepako.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7de48973348201423ce9e72c4b39d099/kezimoterafojagofura.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1dcfef99a008e8446a017f16398079b7/28575951905.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/482f01702178dfa2e3d5bd5c10b382f1/sufulamiwuvokobosudoz.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082879ec71e6---8819206413.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cda56a4b8---59980864268.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1ae05d075ba2ca55323152c7aee1b67b/nenasudatux.pdf
    • http://elmaryapi.com/ckfinder/userfiles/files/watila.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0d919f9d41a2b4dd095941b9f85a7ebf/57511307363.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n55u2brimuatabte0njgeivi4n/pofepugefixane.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/lguiudvof33esaahs6eolvd8qq/77743655238.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=title+insurance+claims+examples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bd.bin
4ac3d1a23e094141f5203e51cbee0e2d8892028f7e8c8a65d774573624468cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 17328 bytes
font_01_sfnt_off00011537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 16792 bytes
font_02_sfnt_off00012d4e.bin
d8cc2256dd8d4c3b4118d22b93b3f52aaf0d2047b49661fbf361003d334e3599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 10580 bytes

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