Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d68cd86958a206…

MALICIOUS

PDF

82.6 KB Created: 2021-08-25 08:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12749eec613b424e4c62252a3b243edb SHA-1: 3246cd6dd656aa4061c790f03a1a0ab8680c244b SHA-256: 94d68cd86958a206a9eb88a81870f776e491b6da4ad513b5688714a60888c0b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via a link farm. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b75773277e8---lupugijo.pdf
    • http://mackyz7automotive.com/js/upload/files/rasijuzugepaxevolulij.pdf
    • http://sport-way.ru/img/file/97903850946.pdf
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/89675247074.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/73041328976.pdf
    • http://yuhongzg.com/d/files/rutefenimolef.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac34e3b57d---rarekex.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f92951fb---68225501305.pdf
    • http://mannaz.pl/userfiles1/file/kewinevifowetawon.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/110a49b391a6b5c4aa22ae2582873c17/lamofevima.pdf
    • http://amphorabeautyclub.com/campannas/file/ketuzukarura.pdf
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/ravelulefesuvate.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8ab5rive17j504b8gmpkv7b69b/94402083234.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bc7bb7e5702ad8562bca1d2ec189e88c/45992673700.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13b7d7476---kamusojetaro.pdf
    • http://renovator.cz/files/file/70604716916.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/bexunagugomajirum.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ac06dfce---sozafo.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/lamuzu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=brother+in+law+relationship
    • 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_off0000dfff.bin
00504db224f129069842b768f89537ae726dd27185fc49cd52ede8a237777c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 10488 bytes
font_01_sfnt_off0000f7dd.bin
bc603e42a657eb6c87583d4c281aa78ebf2e960a8e1ceb28283d2f9e8b9298f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 17092 bytes
font_02_sfnt_off0001249b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 16792 bytes

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