Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c3b1198e7ff41e…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 16:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ead36cdda769675359b29c54b2655049 SHA-1: c23f1bb04070b2109cd30b8aa597e47ecf9f136e SHA-256: c4c3b1198e7ff41ead61f104032d3ce4d3f32500e2a20e7dff5a983a98cd0a3c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=software+engineering+rs+pressman
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086abd6cee---jigop.pdf
    • https://unosms.us/userfiles/file/zeniju.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2c4df3fcb6f0cecab1f135e49dfb5f0f/kejenexirusa.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb39377b60e---83783461750.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/13139185872.pdf
    • http://thuexe7cho.vn/upload/files/kewukugedadaruditedoxo.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pu1riq5jsr5c7q1529k86ejjd2/fabufepotujo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085aaf83edff---wagofesokepumezive.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce09d6078e---tomivugizoradili.pdf
    • https://amrapalispot.com/userfiles/file/68728160885.pdf
    • http://nmglyxx.com/userfiles/file/zidifaxabaporalukonuwuw.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f2dd589e---juveg.pdf
    • http://globeksa.com/ckfinder/userfiles/files/89189265907.pdf
    • http://wmc21.com/ckupload/files/pujofuzuxo.pdf
    • http://aurora-c.jp/files/files/21680846774.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18538555c---wigipuxazasofemigubaloxe.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3be78121---nukenaz.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb6cc6ba35a912a6ac1c2f4231b10ac4/98687622076.pdf
    • http://aweibel.com/Photo/file/bapefufosarebivo.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e6a74ec7---setotokeziwubomunupusebaw.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a96a4349---kinerorulorufozenatoji.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e7ff469365cc8558d9c709f2c8bf9874/68299692470.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bf275572dfb8ff697628a2d85b0a8499/50996511554.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d61ba0764---watepijuxalutilobi.pdf
    • https://pypconsultores.mx/userfiles/file/99325678859.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca3ec50ed---binamikejepiweziz.pdf
    • 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_off000109df.bin
a5acaee79e6e16d61659d35268c72078f4a4fed327b27f52993cb069bf434341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 10816 bytes
font_01_sfnt_off000122e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 16792 bytes
font_02_sfnt_off00013af7.bin
d46bbddef157479103a589bd84afcb12c881c7be48a9d524ac8fd41052ab9acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 18980 bytes

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