Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d3fdefbde1189b…

MALICIOUS

PDF

148.5 KB Created: 2021-06-25 22:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e26e21398b188b9413e06f0e26d927a SHA-1: 79fdf7fb7c299d524d770212de0d1a6b55b96713 SHA-256: e8d3fdefbde1189bb7a693d49d086c6c321a2b63a33442490ef68ce2d547c1a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of compromised CMS upload links suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7005d3b74f---beparutizigepunufopu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hvv8n048qo9jd4o7dbpc7as216/33581169016.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c35d96786---bufisife.pdf
    • http://wildpflanzen-planung.de/file/46507149949.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a305f7a8b5d---53780243810.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c392b0ce---bosinoridopugivusex.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071733fd2746---84111094843.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/244541644a0e8b4e662b78fd3a9d08e0/71920034727.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10dd41e5de---34618328358.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gd2e8jus508am3hfahrqsmotqm/27464842446.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096ef924b542---tufenex.pdf
    • http://aire-limpio.com/img/editor/file/vujaxilututejogufegak.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/kenozi.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/39552896292.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6959bf9a28375ab8d9d57abe71feb868/fexawiribapa.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/01f0d0a536c5ae27cec1f0261b909a21/tezubaxu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/676e43fe60ec202b87448760e946f389/fepijiluduxesadobuk.pdf
    • http://hagelkonzept.de/userfiles/file/dulunubepavewolakut.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0459060ffc6021c44e5954cc60722334/zofuxaf.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/965e54eea794780e3da6a0de483b6e02/40894731933.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8f424f73455cf19241f4040732db3910/fegagev.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b9c3273f79a3fdabfa6c045b248f25d3/59951027875.pdf
    • http://radissonhoteltraining.com/userfiles/file/janekowutagu.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/94051839791.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1u71hkb9ocm2glri0ichdlrek5/kirunawexos.pdf
    • https://incoyun.com/calisma2/files/uploads/dibitevilukorirufet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=common+properties+of+all+electromagnetic+waves
    • 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_off0001da99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA99 16792 bytes
font_01_sfnt_off0001f2ab.bin
5d6807aac4f020d100641bf583252f5ecfad7454d153162ddd0523a3db4721a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2AB 21280 bytes
font_02_sfnt_off00022a67.bin
e17b923ed43e778e940c2346e77080932a9ec9043773144d458e315259aec3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22A67 11004 bytes

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