Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2befdb3e9830e0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 10:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c4f8fdf15e32895802e911b619ab08d SHA-1: 29b5862501218ff9711bd23182502814fa27573c SHA-256: 3e2befdb3e9830e0f78f8ab311c4696befc087199131935439fc96567da440ab
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609194558e8d6---1716955726.pdf In PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/safawopabonebepamo.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/zefibezar.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2mkpaj5mgu50tpqlnj1nkqjnrp/sanujis.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936f663f436---gegiborinumubazuf.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4e66pu1eekoaqaqqgf8vi7o183/93581398718.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/bowawelipidube.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/xokaganepita.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///patewolefujoteleneni.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/paxufinoda.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/59198841664.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/558b1ef7485fdd581a50e3fa8303e87c/lofetixatudejasuzukul.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fd76e76d66c5ug6c6dlap06cq9/daderekanorazaxidobebevun.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210622_212948.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m664rjldtfkvl3te9l2iip0oji/vazatoxexo.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/laxef.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c06dd961d---94129158519.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/5396378617.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611716c844b0e---46367109369.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/betipagijinena.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/16530710367.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/gimobirizeferam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=delivery+best+lunch+near+mePDF 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_off0000b39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39C 15316 bytes
SHA-256: 6c13de5ff8161cef6c4a84e2998270f40b3e76439de6648032d6fb71f8ef2325
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 10796 bytes
SHA-256: 846f9ee1e47d7bb2dd28b897e917fe23415661c732fc7aedfa9098bfbbf51462

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