Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fece59c468bfc69…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 20:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e745060cb62c3e1f33e6f3b80b44f6a0 SHA-1: bbbba3690d98fb719cf730dc46ee71ce338acdfa SHA-256: 8fece59c468bfc69af75bf61395992bdcc854c03e66643e7518a7f1d409a5685
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/15754700001.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e031f6f7---lanakuworovovudibokajuno.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bf5qeu907ir2666bcionc2srhk/pemoxepijegejuvule.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/nusodotesada.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r2sqmnrki2bf8nk313l5794jc3/lulunofonesag.pdfIn PDF document text
    • https://visualarchive.bg/files/56609973110.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/1570048400.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8191b28559---21150117235.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sbo9citc2j47a86c15o22la7d9/kosukiwamaluf.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c6604960---20160607250.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xidijezu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/52993135540.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/21368261042.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/wekuwalis.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/22ee026b71c884778e90c4ad498909a6/21776429613.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160769f48b2728---jogolabimovamewan.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/07b5fd7af87fe1cda74fc8a309a90c4a/32135861989.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0265accc99c9a6e21d7b0e8dbaa63013/93332551834.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095455b148df---bijagobuxa.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hnj1q19qt4lhvgljgipcbp2khv/nezudixugizusot.pdfIn PDF document text
    • http://ippon.lv/uploads/File/firovisofavaxudapamede.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/jadefamivafapopaf.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/79619601924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cross+sectional+and+longitudinal+research+pdfPDF 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_off0000c348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 11028 bytes
SHA-256: 115e445b3164d8bbc4e92788e9b6ae46274d4a29d7ce69c22c58fc153c2139b6
font_02_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 17192 bytes
SHA-256: fa3a5605c6451fa99d1dca539ab049461662a307564e4a9d6745d6aaf6bd3c2d