Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2146b08e583bb0b…

MALICIOUS

PDF

76.0 KB Created: 2021-06-25 17:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c19f45a466c372eef84ad620600935e2 SHA-1: a65d70ba7321ee2ab7e7c2148d94639bea32160d SHA-256: d2146b08e583bb0b236fa4586903d852bfdabfee9637995b556bbde7521c949f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting it's designed to lure users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://clove7.com/userfiles/file/81189360731.pdf
    • http://geostudio.eu/userfiles/files/jafifakewajumikuxo.pdf
    • https://carlojans.com/cms/file/betefizitixer.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9530960f45---nudinezutazixetad.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cnokuo6qk5th2vp82v7c3re3q4/xuxiza.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f69551b9---sapozerapuvuragofiwekiju.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160822bc573ba9---bovadabefoduboselovamom.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080be7041774---89537285532.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a78f39a59---xefuje.pdf
    • http://kadh.kr/bobod/upload/file/sopamekumerotevipurase.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4fcbf5d22d28b89fb913ee9dd74b4f09/71648388537.pdf
    • http://guojingmall.com/userfiles/file///nuzezevepiz.pdf
    • http://usmleworkout.com/files/file/18677428184.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/egffj2h5ii6bvprl5skbod2to5/tajidufuxolikowula.pdf
    • http://hnc2.com/userfiles/file/nogaj.pdf
    • http://accessiblevehicleservices.com/userfiles/file/wategopomopubex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kingdom+hearts+chain+of+memories+trophies
    • 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_off0000c437.bin
6492938418568447b0f2057d61749d275097e86dd16935bfa83bc6553283b1f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 11012 bytes
font_01_sfnt_off0000dd69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 16792 bytes
font_02_sfnt_off0000f57b.bin
8cca2fbad721425e53fa2ce49ba7e599ae2ebd6355965947bfb1274bf3dde2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 16760 bytes

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