Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a64fcc98b6d1114…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 20:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c854f7486792532910c5d6af9b6d51ef SHA-1: db43060922b9124fa38fb458b2f1c169aea79ea6 SHA-256: 9a64fcc98b6d111489431ed52089fd10edac5137d11bfa00e2bfdf16f4833e1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, offering no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e93c9c8914---75705408052.pdf In PDF document text
    • http://motorlustor.net/userfiles/file/rowobuvawaviwatuwif.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/87660535636.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2390584d6b445f2006365c9286ef6cb0/33582091082.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6mjq6f8g6ranjse3ehjvgoldkc/88284480321.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/mokuxiluxi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/12208655628.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ffb58e90a---gixusedaxisaxufapo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5qt5u3emag6sgc2fkhol64ps88/xebagabewufovutineg.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f18313e655fef0fd9ec95ae6609397ba/veruwatovasebeluxizegu.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/98347739685.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01e7ec173---76250865803.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc3d113fb---35287103312.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09411e3fe---11337052319.pdfIn PDF document text
    • http://myredm.ru/uploads/file/ximanugalejuv.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5a16f5faca8dbc5eee8a0d1c15f595a7/mipumumuvurazazozad.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/61784319540.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0gflejkhdqt8ppi01dbc5fnsec/marimaruwegamonu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lunomipegipovomujizufikiw.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kcfjr9cl8sh9inf1ef297fg6i4/39913278279.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/33548971562.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b585be158ce9656330073b060b2f746a/22271994847.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/27091426331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chickpea+carb+countPDF 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_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 10620 bytes
SHA-256: d2462920c68cf6abe81d8ceda4e7ed7c5dc4f6ae501ab07ab36a453131fcd626
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 16844 bytes
SHA-256: 51565417caddd7924eb7058ba4da23dcfab7a5ed6c65340e5972ac9886510ab9

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