Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1255ddd0cd74551…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 11:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90e79ef48c073fd10ae043f6f43fc7f6 SHA-1: 2f4a10a7bfb99cc8c79d29d8f648874e3d74ac1f SHA-256: f1255ddd0cd7455183cd39052acead29d6d1cc5cd77dfa4e8ee91e7aca94c248
64 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2384

Heuristics 4

  • 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
  • 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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f16215f01---xunufifotovif.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161309f4178b3d---29088996153.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/52212287222.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/011233422355.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/juxidufexexagazenik.pdfIn PDF document text
    • http://szm.hu/userfiles/file/43119460184.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/jafodogijuwasebolow.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/41990063388.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/80696492029.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cf507aa1a8a18ae9099ee3d8fee0ecca/garexe.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/83872692176.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/tefigo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/fivimizuzaka.pdfIn PDF document text
    • https://uangraja.com/contents/files/5516569273.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630643529.pdfIn PDF document text
    • http://wirheiraten.de/images/file/90566450071.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac86edd0a---62454493186.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/kuborefipir.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f97f809---75274175086.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/zuvesi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/koninexezapibatapomu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/71415306181.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140669fda032---45968691891.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/69226830913.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/86229140526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+32+vs+64+bitPDF link annotation
    • 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_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 17860 bytes
SHA-256: b24b17727afe3b002e0811ea45b25a3675045bead915e79a60cd70a167da341c
font_01_sfnt_off000148dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F4 10628 bytes
SHA-256: bee12aaadf846402127d0642f57c2f1176b47adc720459c96b3f2030292730ec

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