Malicious PDF — malware analysis report

Static analysis result for SHA-256 50908203c5eead46…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 02:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 073d10a743fd1256c73e70fde30b5491 SHA-1: 57d5e724764960d341fa662e432d516c325ee5d4 SHA-256: 50908203c5eead466807a596ee52ba0709fa6ed6d436c309305c48fe9fdbcc7a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=201+stainless+steel+rust
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991c5723ce---16736015776.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b00b1902412e08402fe4c86735d3f116/fupamavepalukudabisimi.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aiimd6vn4rc5ljs213228n7i3b/78433146219.pdf
    • https://briljant-maleri.se/UserFiles/files/35293817792.pdf
    • http://mim2010.ru/userfiles/file/gajub.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ba0aba181fd2fd8c7ba1b1a602be17ca/84317615146.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/khef4g2ph0mel62oi5smiftq52/sezujogakuxubuzizuxura.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094820c4b184---6627523277.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce385970b6---83528243796.pdf
    • https://www.carrentchiengmai.com/files/66376652948.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8gip4tupv5oeakdds6boskeces/pipijedumev.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8f4cab6e6c491886b1253fbdf8dbc594/junivikuruzilizukavevalu.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa90e5948---97394859691.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v495qvfniq69furfs01q3pn3d1/wapoxusefalevijil.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e6f26f20---63122178733.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/93430154227.pdf
    • http://belgium-ex.com/jenemumidinaduzufixe.pdf
    • http://ayhancevik.com/images_upload/files/jujikusogiga.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9aed931e477907084d3defa629445362/39104490701.pdf
    • http://davidhammerstein.org/userfiles/file/dupitejani.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/crf2to49lnip5fr453idgmvcep/kuxamovozaxakabuzojufewe.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3a56c58e2c0dacad9ad64994a83deadb/64355351561.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/74738182846.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aab194b24148b62c2c01d6cb0989d5dd/86609596951.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5s9dmtvgcl3smd0crlbucbd6h4/29159299276.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_off0000f3ca.bin
7f78bb0a35f2d88df86098c3ed9fe2f9df2ec2b49db3ba4d1fbfaa1aa381997f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 10280 bytes
font_01_sfnt_off00010b26.bin
e3389dddf9633069c4b063d076f9fda2902e26a0887a2d4f54c8e1104c516155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 18524 bytes
font_02_sfnt_off00013a7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7E 16792 bytes

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