Malicious PDF — malware analysis report

Static analysis result for SHA-256 b237364d44aedbfb…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 23:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfd7d335236e541f16f3a6b28700a723 SHA-1: 19f88ee842505ea6dcf04374678281ca13641fd8 SHA-256: b237364d44aedbfbcc8b6cdf1bd603c195ffba6ccdade9fec8f029bf680aa856
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

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://philabc.ru/uplcv?utm_term=how+fast+does+sweet+corn+grow
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f8118d9---13705076446.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657ebac543---zinul.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/7018032142.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c29f3a01a---xinedet.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3c7ae613---mejivuwalozuv.pdf
    • http://aucoindeshalles.fr/menu/file/21241899452.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608599a4a8a51---2613112272.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/46814742132.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/446e7d77113a809684918ea1a215172d/3554280073.pdf
    • https://lemanssrl.it/file/69261538099.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/59e7b531e84c76c3765ce56928bc368a/78953758891.pdf
    • http://malbreil.com/userfiles/file/fobawagapevekoto.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb2fe1f6d---99770846242.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/bddkv69evomj0jffe18omjkqci/bebigoj.pdf
    • http://animationcoach.com/userfiles/file/62756596371.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/dutimuluvenobifedirotewim.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce74a2eca73---buxizomiru.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/18761202520.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745ead176aa---84692929868.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/5vp89tcpdod8rr7mgsfc5khfc0/39125822558.pdf
    • http://tgtech-auto.com/userfiles/file/potaxudufilasutok.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ba604552ae8b56238d193644a2a2c294/dakatajogox.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j5jl3q6h6m1mct05piuek3f595/99415437278.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d91ed2dd00b---21903589813.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2422cf739b62681b46c1cc6c9d798556/13259699943.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_off0000f138.bin
17f403c5d370b9617c1752d93800da099e2cbdfeb2f3930277378e7d3c2bf12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 16972 bytes
font_01_sfnt_off00011d71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 16792 bytes
font_02_sfnt_off00013588.bin
c1fa59e51e9cd071a7f299bbfb98ae0f5d914a3e375e069fc2c49f66af80df67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13588 10588 bytes

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