Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb641f2a3640a518…

MALICIOUS

PDF

92.6 KB Created: 2021-07-14 03:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 281177985518553ce82bdd9573a449c1 SHA-1: a734c065a7ffb4fa6a70577ab1da1bccce801b20 SHA-256: cb641f2a3640a5185208ff53c9ea71d5c4f4432cb1e2b074d4b79fe2bc0ddc7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure for users, potentially leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=real+estate+ico
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6fa9c42c---73544654509.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s5ldmj8er9gp0cuftumfpvcdck/pofovijuzaxixegi.pdf
    • http://afghansolar.com/userfiles/file/kasamademugujikiso.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c964c99af5---tapituta.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8d8c11cbb2dab91540be16c900dd1411/9633497541.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/39dc3ae7d3ebc2f5e2ac60fefdb93995/17748261965.pdf
    • https://aashianarealty.com/file/84527975613.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4b9586e82---minupuwobokixe.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b73a2fc3---87021895034.pdf
    • http://dieta-plus.pl/userfiles/file/kogaxizusin.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1ocn42jp0teje457omueij4d0j/wutuvita.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4d777e1c---66094425880.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xamimezese.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/uivn5qfllmb07herjhpvmn5j55/miwumutokekiju.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/runugeraresekumuxokat.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0gkduoido4hpd9rgar1a4kvu9j/vajaxitexojufifu.pdf
    • http://apsons.eu/files/file/kimumo.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a685e8eabd1---zokizigolide.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f171c51e41fc7ab23ab57031aa2a094b/74432503232.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a426b7f4061---nupegumowetuzabimiw.pdf
    • http://stalmost.pl/userfiles/file/demajaxumagugulupavujel.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3e987e9973afa3d425b0d0568f1b64e7/74811793581.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_off00010a29.bin
0cabdd88e391c53790747aaaad04f2569a3f00ea6265cf39b482a943f5617fa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 10064 bytes
font_01_sfnt_off000120b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 16792 bytes
font_02_sfnt_off000138c8.bin
1fa00fa7e0febb6b25789f158ea4aa1e996fa941f37a00579bc347044ea52093
pdf-font-stream PDF embedded font (sfnt) at offset 0x138C8 17040 bytes