Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f265838dac8448…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 23:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd2f51a3040ac45b0f0866c75ccec567 SHA-1: a3c0f9fd7d8a762fa48af03cadb98a7d8838ee8b SHA-256: 73f265838dac8448c252f4d8fd4e6dfbd0735d56c7cb11d462bffc711a2a1306
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to disposable or suspicious domains. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose, which is likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=can+you+plant+tulips+in+january
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16090333a5e33f---51863280345.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1223d3c16---77239934234.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae408c0be5---13926257868.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850a9f161e2---lawidilibuninigixatogu.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb68df705---moxololimut.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ad451762---kozijarukesixugelupog.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/85a7cd4a7012841419a7e2737720edec/4504626525.pdf
    • http://hykylalumni.org/userfiles/gugiwagibamovir.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb19c6b7f---98136372695.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/891ca3ecd23136c508fd8c70788a9140/kozuliwadet.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adab286ed6b---70552150611.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/wapez.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ct12vv1luk7ga2odoq33phalo2/84028578204.pdf
    • https://fullgame.hu/uploads/files/zesivudomajejimuponogojof.pdf
    • http://phantasos.org/userfiles/file/ronat.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ektos78vp4pr7u6fcpkdleg19p/84701222133.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e4bd4bff---39651578183.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63e504fd7---lonoziresopodetopuwef.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083605b8ce75---39094492137.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade718b4a6---wepotogadokidew.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12ceb1b05---vegusobivezuloxorelo.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/97022da5b847489ba1b0183b46c5a7ae/fatobajatimawuvuma.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/787b96e7421099f8166a8964f9fae3dd/52376270743.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_off0000eefa.bin
3528dcf38ba12c625c487bb81505989d4390ed0b76790fcbff3acb3dc2fcd982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 17072 bytes
font_01_sfnt_off00011bc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 16792 bytes
font_02_sfnt_off000133d9.bin
d4780f10aeff1b517d36527fbef3d3686e79acb9df9666a59bb556d3867b651e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 10488 bytes

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