Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7926c3518c93aa…

MALICIOUS

PDF

418.4 KB Created: 2021-06-25 20:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82627cd714776eeba4e7775de67c5b38 SHA-1: 73b10f2fe27023fcdc929b6f81c6166c6d93fb9b SHA-256: 1f7926c3518c93aa0837c0a4d88d7808bd0e6bf0afb2dd80d6073404bb5ca6c5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains multiple links to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass security gateways. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8396

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://medvor.ru/uplcv?utm_term=war+thunder+ground+forces+crew+skills+guide
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/e9567e7731c8c2c846f12b397f54f80e/verebejiwosogoselo.pdf
    • http://michellesmithscott.com/clients/36670/File/wituwabotabina.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/277d3c1413cf686e74e2d8970425a0d1/76492976784.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5d8421d9a36605062e7e91081fb50d2d/titimaz.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608118f54d8e6---zuxewida.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed9459d2e---wuroxavikasag.pdf
    • https://balajihighfields.in/userfiles/file/ruwozunafimimepawogokub.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e81ed3242---91788574960.pdf
    • http://kursadowicz.pl/Upload/file/tizogeraji.pdf
    • http://sinproval.it/userfiles/files/84911660422.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eda932e1e---zolalefugo.pdf
    • http://impressivetravelvietnam.com/upload/files/nozan.pdf
    • http://chinamakina.com/userfiles/file/13242668083.pdf
    • http://nuestratierrapremios.com/campannas/file/bizowevavakenowig.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/23949931222.pdf
    • http://koryosushi.com/uploads/files/lojolebatijemuk.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dcf1db82b---59011195808.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9015cc509f60c1e97e2bc38cecf5b7f6/fajudekifopoja.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3598b081d9---wulexeze.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1bb5cb015---84448401825.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/afksnvb1lo9hsu1nu9qlua8n1a/23982956783.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_off00061664.bin
e180f9aad1711c7ce9c838166407c85cb372a8c49a0c7955d2721147e9a95442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61664 18624 bytes
font_01_sfnt_off0006471e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6471E 16792 bytes
font_02_sfnt_off00065f35.bin
e8fae2aa2546789c61fa48747a5bd6813d249b54d5750bba7579510f05440125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F35 11028 bytes

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