Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df3b14f1f4246ea…

MALICIOUS

PDF

94.5 KB Created: 2021-08-10 17:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 896d9e77926d835769fdf2563d0ef6a2 SHA-1: bfa38be6785cad3c5e092ca70ff4ebe9e483966b SHA-256: 2df3b14f1f4246ea733ff42dba2effcb6c14377104d7be88d8e00831471b81e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document is designed to lure users into clicking links that lead to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a3f82848216be07f8568c521b2c75101/fofunesowowosixinod.pdf
    • http://bhhangkhong.com/upload/images/files/zuvulokefokokelaviwunog.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/nexosalizudoburivoxam.pdf
    • http://emailreceptionist.net/userfiles/file/xotidokuxaninobubiwasad.pdf
    • http://www.motionmantra.com/userfiles/files/50467330260.pdf
    • https://tlproduct.com/userfiles/file/batadeviw.pdf
    • https://muratay.nl/userfiles/file/lojodugeravazikov.pdf
    • http://rollfactorytogo.com/uploads/files/nutegelexokosu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827a7216303---66415282663.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ac982594179869f49d6182c48fdbe791/24585662096.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d457f617c011e44f4671c69a7cd601c7/kekewadipuzonisosogesot.pdf
    • https://artinterior.bg/userfiles/file/51282524817.pdf
    • http://kochamsushi.pl/UserFiles/file/57041779596.pdf
    • http://oipipleszno.pl/userfiles/file/46194189360.pdf
    • https://aronabritcan.com/userfiles/file/vujululemovobi.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/dovetederu.pdf
    • http://ned.ru/uploads/files/28912275016.pdf
    • https://bawwabatrizq.com/userfiles/file/sarujomodesovovuxox.pdf
    • http://ingmontagna.com/userfiles/files/18754342065.pdf
    • http://cauthinh.com/luutru/files/kilujatipekutebawizabufof.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d640f5a80493106feb69e7237e0f2a52/fijoromobewixu.pdf
    • http://volvo-cars.jp/js/upload/files/73771490206.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c0bd6552496461199c19027554354fc/49000797063.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072241a117a5---fizabazuwipesivug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=debut+video+capture+software+pro+vs+home+edition
    • 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_off0000f3c2.bin
00c9a40af429f35e5c6bb3ef66dc925c9a6829c88ceffa28c417316f9fe3e0f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 11232 bytes
font_01_sfnt_off00010dca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 16792 bytes
font_02_sfnt_off000125db.bin
b58dfd149bb32798accc05e001972cdaf9a0834bc8ee584f386596aeb2b1d3dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 17692 bytes
font_03_sfnt_off000140ae.bin
95ec0a95f48d37a62507407654ec37fd7182b5d474cf05e3e745f9f569dadd4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x140AE 16432 bytes