Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe4fc72fe2d895b…

MALICIOUS

PDF

111.9 KB Created: 2021-07-03 00:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b124fc4e93b1848021e59e424ec5d416 SHA-1: 4939e726eabeca2ce2abb7578ff65bf2b99d0889 SHA-256: cfe4fc72fe2d895bbd43f60eceb9b22a736e36e7b83a1139cd718a9c2d62b66b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload storage and other disposable domains suggests an attempt to host or distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ugrctrani.it/userfiles/files/35017083981.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a63b6d366---jajiwalobafeso.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/viwevep.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qgaadh6an6c2mlc1icdrc4ms66/9705741425.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab481a68596---65954560964.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6cd49eacdc405e8d543b6690040e9a2f/dapodifajuta.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/d7h2nd4173tcphmfc92idedb61/14183630256.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/ad5d98edb4988f018454c5e3ba64edde/mafigeripafofuzuligejaw.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a19775805b3---22682555613.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95e7d8e6f3dea64cfd6ae7ff187fc11b/41519650600.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefumitiwi.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb190cd77f---taketetep.pdf
    • http://banghetretunhien.com/media/ftp/file/71332986537.pdf
    • https://decoveinvestment.com/userfiles/file/16256270446.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/petekebinimi.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e85a23bf---66654683355.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b7lgih8e3b60gji5qav4uh9ik7/36772956877.pdf
    • http://studiotecnicobonoli.com/userfiles/files/90610152009.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de23866dad---19616501079.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/398d7b5437275cbe632e8fb72a4c6420/gawezodus.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b0e2e05aa45832eabdf7ff3446a2a576/rutase.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf13421c5a---lavukisuborovikelapi.pdf
    • http://gangwontaxi.com/FileData/ckfinder/files/20210622_FB0E0F930EDE257E.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae784e9664---zoxafekomunanivibaso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=left+bicep+twitching
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 16792 bytes
font_01_sfnt_off000154db.bin
9d7f842f431cea2e16910d6770151554261f03bf07739cebeb636f0063641530
pdf-font-stream PDF embedded font (sfnt) at offset 0x154DB 16680 bytes
font_02_sfnt_off00016c20.bin
46f9a315d0ae63c5c8cdab844c10a62057a1384a785525ac211dc35dde744c2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C20 17816 bytes
font_03_sfnt_off00019a96.bin
bcb463b53e99747ee3cde4c30fb4c55a8a343c72743042f3a0a95491a8c8f588
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A96 10348 bytes