Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c17b71978c8f05a…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 13:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08c2ff5bf4e2bf981481c7d0f2f21cd5 SHA-1: a380d9a4970bbef7c7825fb4ce0fec4c2c26d5ec SHA-256: 4c17b71978c8f05a4e5b87df88647d1f25753e76166ffa41dbd8a64d81f6ed5f
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a malicious intent related to link farms and compromised uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://ruilong-ironwork.com/CKEdit/upload/files/povurukewupuwarafaji.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/linupurujezawimurud.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2e29070a---rurevexepovidudapimuk.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/918c43f10a61069cfe2900e1cff1c76c/50576816003.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b4e4deae---9996365502.pdf
    • http://fdscience.com/UPFILE/userfiles/files/17391990073.pdf
    • http://artecgroupservices.com/imagenes/file/9425883780.pdf
    • https://arab-hams.com/Ups/files/wuvopu.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/inn8ms1dictlgrlop9tj3jhsa6/forinabikebesogaxux.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0abbddd1b---77218900895.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qu1s79vnije5987jkit3btfi8l/fiwufofaroborotajitetalut.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2i8qkhhqhm3k0bdf2ci4p7mr0s/19411998036.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735c3e40b7f---17207519426.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/da44beface0600c3db0fcced962df062/78971699258.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a79bf3d15---fuxigufumejosebeti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+android+shaders
    • 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_off0000e59e.bin
af6f5d99d63e2c126677d17dd3c605c6bb2fb8f2c27ebce92c044170e4eb5d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 18236 bytes
font_01_sfnt_off0001134e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16792 bytes
font_02_sfnt_off00012b65.bin
9402931f914c8155baac0580d37d329f4b36bd5741e9e894595028addb0d42b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 10520 bytes

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