Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd915242833f3fd6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 04:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8956f6dde59f3f5a44b4e9350bb4398d SHA-1: 3bfb4c2c0e4468a193c1e3dc56e9ac1cca07d2e4 SHA-256: fd915242833f3fd6199cc96194ed3bd28b4ebddffe4eaeec01b8b685fc5ea1fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://huh.hu/UserFiles/File/xezunezisakibaxoxu.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607466d0ba4f2---nuzanemagorunu.pdfIn PDF document text
    • https://ms01bet.com/contents//files/79632397256.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9256064df2---kegakolovikudivopepokil.pdfIn PDF document text
    • http://erictex.com/ufiles/files/37843353532.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/fiwezu.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/71296638150.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/39922624254.pdfIn PDF document text
    • http://geodez.com/pliki/file/tunifujisejepu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcced8090ab---dulanutuwizixazetakazulis.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/buratepisonixujalewam.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/lugelud.pdfIn PDF document text
    • https://avenue102.com/uploads/file/kudixub.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/xakidejidilanavukibeso.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/23941113486.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9c3be5853---41230410681.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/buzutavop.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098931a69b5d---konowopujuzidav.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/puxiwimo.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/27034182541.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/37932816095.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/vipigojisawogelara.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/7048769705.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d2kh10ku0rjk79s6pm02ojec61/65667654441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=another+name+for+fatiguePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 17072 bytes
SHA-256: 7126c4e8e777697c76fdf5e49c56c295923774abe804c7a311980116fdda6cf5
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10528 bytes
SHA-256: bf0e12df2376117beda41a8c0bfa0fc0885370dd478775188aec8089ce59b7c3
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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