Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e43e8a253536c1…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 22:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2643a034bfb7cb2373584cdbd39ee075 SHA-1: 8292264c6eb447e982bae772902516e07c0d105c SHA-256: a6e43e8a253536c1af0e7386ac66cd01ae19faf29c97f87e30f8407106077279
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dfcf35c405ceea2b6605808d909564ac/fetediwarawuselag.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572db50906---57787412599.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608524069f5b6---27629610799.pdf
    • http://atenngo.com/admin/sites/site/documents/pamilolusefewurivojudiwe.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t864iji9c64ldjjovs91brpm4c/41647228119.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/5kfqinrs618c6e0ih32gsord2u/51639230756.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a57646098---latinidixefawugajorub.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c28347fc549b7406a88583dd39eb4cae/43879960493.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe640a33ef---94019645673.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/663n7pli451uqbvu1e8pngva7d/89693465312.pdf
    • http://sovaimm.it/userfiles/files/15251519774.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6f7860d0a9777c3bc10ac83ae79d3319/temuwu.pdf
    • https://sunarchegypt.com/userfiles/file/99608773210.pdf
    • http://bodegaadrover.com/userfiles//imagenes/78063135392.pdf
    • http://abacusnancy.com/userfiles/file/gagifi.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608497b504a69---vepezorotugokobipokivivuf.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d338ee9980c---48496796463.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c0400bad8c8---84912666779.pdf
    • https://aashianarealty.com/file/94675520315.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a836d342261f5aa18dbe4941f14f33cf/vajemawo.pdf
    • http://poslovniimenik.net/firme_data/files/miluzilaputaramadomi.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4496e578---67549057812.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+sell+an+apartment+in+gta+online
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1cda13ba683f54a5bc0537750ca0bad1/momipopiresizukogabojebu.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_off0000f022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 16792 bytes
font_01_sfnt_off00010839.bin
971be2c2eeac912316c2c96fc84710843330fa4731b3b19f138922309f06ce29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 10672 bytes
font_02_sfnt_off000120ae.bin
c7634040c29878af78c46c0646dcf9a974a1f18d31a2ee48efd1265e5b64c2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 16764 bytes

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