Malicious PDF — malware analysis report

Static analysis result for SHA-256 227e1be3243a1202…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 05:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d671e8df5131401331c187d081c94b0 SHA-1: 98af2ac4f98afa6bc4e38c900ce2139889e239a2 SHA-256: 227e1be3243a1202b8ae408454f6459141409ad72d89b819b4b2c72038312d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=how+to+reduce+heat+from+face
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed28e70bc---kofarojed.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098998edfb24---mezibemevoboxi.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731b5ecda98---1027811902.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d1896b3f4---gixaxosubewevozemaba.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba45c75c92---pizakadafim.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/jamaluwuxuvutap.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/34b8148fd13282b42ed66d736f9d22dc/zipuradegavasitigu.pdf
    • http://falconfam.com/ckfinder/userfiles/files/tumivatazetilodosujixaz.pdf
    • https://thuaphatlaihanoi.net/uploads/files/parow.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c3420560e381043e2c4bd5a157553a9a/domironokixumunu.pdf
    • http://vervesimuhub.com/userfiles/file/67137802513.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/g2tc5hl9qe9cvguif40lbuha8p/nojirobuxif.pdf
    • http://sattamatkapatti.com/userfiles/file/jimodoxurelejemu.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082f22400067---jobedokamimuget.pdf
    • http://betenagro.com/sites/default/files/file/nojuxesosizuripagerot.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/95321edcf2933f6ba75138bfdb90987a/81704103719.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c49e3b9a9---26655568103.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd24656183---mukavemo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f4e0f8cec073b6a85de04a94647c5ae/bizedarebevekafinu.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7eebc099---bagixinumatovufebez.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hlj0b5jt27g3ithkjtf3svo01g/denalerulofe.pdf
    • http://bachova-terapia.sk/images/file/nudusupanovunavuza.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12f3ed891---71555245966.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/38d1aca49cfb495b614e35cf4d52df84/17314788284.pdf
    • http://slhs1958.com/clients/18590/File/pifebi.pdf
    • https://tolgyesvolgy.hu/userfiles/file/1541512175.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_off0000eeb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16792 bytes
font_01_sfnt_off000106c8.bin
75c7aca1f2df9746ce2a44f14320e941dde2a4a35280120546b1a59043f6663d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10508 bytes
font_02_sfnt_off00011eb8.bin
08a5f3b5b3179ac5b3e3247279664ae9b2e40d30b712032c46cafd5553654cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 16912 bytes

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