Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31d42faef9b0c04…

MALICIOUS

PDF

98.5 KB Created: 2021-09-01 14:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7f5b9426c5aa7bbb3b918c057676a3de SHA-1: 6c9f7b29d01bcab70c37fa88f26ccc3ca943984c SHA-256: c31d42faef9b0c041fbd06ea6f98103eeac89e85ab280ce11bd35e3b4829fb1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://romengo.com/ckfinder/userfiles/files/xilabo.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1811cbbff8---litoxojedinazadupegodig.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/32755087669.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/79276344673.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/nakaxutuvenuwopazoxab.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ca491358---65879213776.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/legufusilowasoxowiz.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/dapapuvaxaxelobomalidu.pdfIn PDF document text
    • http://jucal.es/images/file/27076678342.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/kejomebasipusemipuzet.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160794ba75d096---durowamiwubifunovop.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/vevovavofovudax.pdfIn PDF document text
    • http://tortugafilms.ca/adminfiles/file/juwigasubezowolerolap.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/21517e8b22dddd13b575dc49e3ed7f1f/4120294090.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6625be76---gaget.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160767bb744686---65455821806.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bibijuxiwuzaxawatizoxujid.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612cde4e80cd8---3275700359.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/943c6cf4cfb88aeb58647ccf577a3d02/87299971841.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5237c416b---15908475827.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/95424362139.pdfIn PDF document text
    • https://ubranni.com/uploader/files/50258947766.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3378a7ffc3ac60ad7b242d911c56c42a/54200740148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=in+a+centrally+planned+economy+the+three+key+economic+questions+are+answered+by+thePDF 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_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 11408 bytes
SHA-256: bba520fcbdd00777451beae7ad96bad6035c72ab5f18efe29768d76845e0bd92
font_02_sfnt_off00014c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C36 18036 bytes
SHA-256: c54e30904de729c6c889d7f0518cd5c42d90d360b9d275038f710bb980a31da2

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