Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d701a0af8aac52…

MALICIOUS

PDF

71.8 KB Created: 2021-09-23 10:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dfd12da2fdb386d3ac2bee497217459 SHA-1: 4818ee637380f881a882a0e564c987ca147396d9 SHA-256: c0d701a0af8aac522ad62b96e629d029ec49449494016e5920c9838662cffa28
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a tactic to obscure malicious destinations. The primary function appears to be redirecting users through a link farm, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://odnoklassniki-files.ru/images/uploads/files/verodujolazufatijakape.pdf
    • http://resheto.ru/users_images/fck/file/zajovijofisukagimison.pdf
    • http://saconsultancy.com/userfiles/file/44889246452.pdf
    • http://becucci.it/userfiles/files/2540402269.pdf
    • http://35ct1.com/images/ckImageFiles/files/kojonunutaje.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/28635086332.pdf
    • http://simpelms.nl/userfiles/files/95669112552.pdf
    • http://yaqeen-eg.com/userfiles/file/purevenoliso.pdf
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/rilebuxiwulipaxafogepumor.pdf
    • http://www.saletime.gr/admin/fckfiles/file/85894290570.pdf
    • http://madmojo.com/fckupload/file/wizuxe.pdf
    • http://rigassprotes.lv/uploadz/file/vadazolevofagujido.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140031037dda---50038842273.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j86jhmqps8bv5g6kjjjq24j4l4/xolepu.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_8C889059ECA60BE5.pdf
    • http://noithatmyhome.com/img/files/77264433141.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416c786ff9e---15521866571.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xeseji.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d90c72a3---64778599523.pdf
    • https://aayams.com/userfiles/file/23768201206.pdf
    • http://agt.es/files/galeria2/files/44981095153.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is+fortnite+on+pc+free
    • 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_off0000b97c.bin
c6e59c5da79f172ab81fd278b478d178377d0d51d36df22b41e074fcb9362fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB97C 16268 bytes
font_01_sfnt_off0000e2b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 16792 bytes
font_02_sfnt_off0000facc.bin
2f23de5a90f6cce9a84ceb4db03e78b67630caf41c0cd92e57811a394fccdf20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 10216 bytes

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