Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fafda03e35bfd6…

MALICIOUS

PDF

87.3 KB Created: 2021-08-13 15:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f9c429e7f10f174fa2cc2a2d00142c6e SHA-1: 2665679e1d0e83ce5d9ab622fc5236d6dc8c7e3b SHA-256: 97fafda03e35bfd6d576a4f069cfcf063677b1b47e629401a891b93ce85165af
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation. No scripts were extracted, but the structure and URL findings are sufficient for a high-confidence assessment.

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 https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609180a6b95d0---67740676082.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3448118d181ceab02744321bbe23134b/99357065019.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92ed4ec7c---51666595043.pdfIn PDF document text
    • http://zxsolar.com/d/files/bijetawuguzoxi.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/1288914560.pdfIn PDF document text
    • https://paperland.bg/uploads/file/pekulerepinojexevuvi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814b8a090c---89759192196.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/movuzi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1b858206acd467661b5b5b31f8c9a351/62269210234.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08847a67b---93538775412.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e8bb2bf84289145440cf9b03cff13f36/53463342181.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbcc24e74---gipaji.pdfIn PDF document text
    • http://azizolace.cz/images/file/92552516114.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051401474773499.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088b9ee8a2d4---3133945583.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/69580446243.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/bifagopofiminejekizeg.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/fekinemepufitojolideto.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rf7uruvg23llb85k7355goafgq/85510818791.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/52665428024.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/gexokuxalem.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f457b0d0b---87539061581.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/giwivuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+solve+inequalities+precalculusPDF 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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10756 bytes
SHA-256: 2caf5ac7a76818b2f44129ae316df3aa25e871b30d01af4ab140bcdf5705f938
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 17660 bytes
SHA-256: bc692f54f3384e4464b17ba7b851725c45330a2ab53ece5a5eb7d1ca793b9ae3
font_02_sfnt_off000135c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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