Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db956db06ee42c2…

MALICIOUS

PDF

88.2 KB Created: 2021-07-20 07:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48c050dd1d54a7aeb59ce8703333ce31 SHA-1: c7b75bef9ccf2a4ee958b329f9cb1bbe2280b37f SHA-256: 7db956db06ee42c26a4d823d496046d120bceaa363410fbd08cba7e54c291061
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the 'ML_NYX_PDF_MALICIOUS' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2ff40a7b---jiketenamodo.pdf In PDF document text
    • http://nakatka.com/files/file/24116082020.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be6f20f08d6---salov.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/mesufori.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/22810718774.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bdc1ad36b---89554651715.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8eg08587426q8r37gguo4spd43/gupokovepijifajoro.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2bfbf2bc---15713920646.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qnc32kvr8piem2s2cjh59lm2ri/kirapusepoj.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/pedin.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ec42926cd61747b7d1184952eaeab7d3/tukafekemazetuzipebanafaz.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/labojuja.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mt1rnh96pirjoe0qf6r7tvrhf6/27103665555.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1269a6ce84---70472329632.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbac79f00---88944909725.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c81fb5e3a77a5fc628707458753d5ced/bufaturisaro.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/604f7edf269d4b2c1b08de50945f633e/fezawuto.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/37558996949.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b1fb0ae5---bemedorumediza.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/93834435411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=business+law+pdf+ebookPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/92bbedd4c2faf61f1e426c98fa8b17a5/84043402751.pdfIn PDF document text
    • 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_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 17360 bytes
SHA-256: f2600815a49c2d7807508f5089a2c76307361e2f6d93116a5770eeddd8779dae
font_01_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 10764 bytes
SHA-256: b2bbd4c0b0a1120fe48427d8e8b1e23e8a2c94a050b6c9f8986d34cd70d79b61