Malicious PDF — malware analysis report

Static analysis result for SHA-256 313ebcb24f890742…

MALICIOUS

PDF

81.9 KB Created: 2021-07-09 03:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37dfd6d533e2925f0c83616ff0492286 SHA-1: e9be4c9eb8805cae2bb6b79715b5d99ce5826665 SHA-256: 313ebcb24f890742687fc60f6bffe6df12dbb32d8434769838d6789ec7ec32fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution campaign. The embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ludifrance.fr/userfiles/file/gobatozebojekesudamed.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dc963d59d47054ad94aca6ebd1d70c1e/23447428188.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3e18f0edd724d56c474ced43f65d1d48/83228290606.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b37e400e986---zidupajabexivano.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2cd431bd---kerefiwuzexu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f1c26657---sivodovurete.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fd19e384---69510952731.pdf
    • http://majorpropertygroup.com/userfiles/files/93390878022.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b187f53bcad---wivekerax.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/50843605634.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608504f7ba80f---18851635270.pdf
    • http://accessprecision.com/userfiles/file/77304362774.pdf
    • http://bookblog.kr/data/file//files/2411754478.pdf
    • http://dentish.ru/ckfinder/userfiles/files/bobebajawuvixe.pdf
    • http://mnogonomerov.ru/uploads/file/mofudokok.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badfc9c9f6d---98100538076.pdf
    • http://alliance-ltd.com/userfiles/58116618719.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c139e9d1---febunovokiparufodid.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/155fb60702538389cd65cff703492919/mujatijifepuzegas.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03a594c31b---91409542686.pdf
    • http://alhouti.com/userfiles/file/62994501115.pdf
    • https://pabrikangka.com/contents//files/xumetaxavovil.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9d7d4bc96063e071560219a3e1b33977/84818543571.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/0plu8uhqvkho2hbsl7bas8n5n4/86525332275.pdf
    • https://chmelo.hu/sites/default/files/file/lorotorimeguzo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cambrian+black+leathered+granite
    • 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_off0000db83.bin
929f2fe44c0f8f1986ff20736864b9658bcc158dd88bfc7e42ee302aee756d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 10792 bytes
font_01_sfnt_off0000f3ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 16792 bytes
font_02_sfnt_off00010c00.bin
8a7217143b9b5af7bea69f49f235e6df2984f8bba14061400a22347011139ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 17636 bytes