Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a38f7e4dbdc3af9…

MALICIOUS

PDF

93.9 KB Created: 2021-09-04 02:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5421ef387f591af15136b8eac2e63ab SHA-1: ae4695db843061046ad55e7e2490e5021d978217 SHA-256: 9a38f7e4dbdc3af9acd39464c234b8a77e071a8bf5652cef0efe5cbbd2651f64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with multiple URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://quartierdete.fr/uploads/fckeditor/file/bodolum.pdf In PDF document text
    • http://giadinhlaurenso.org/upload/files/16097243717.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e31679e556d---falotasot.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/rutomepajedu.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/60392136017.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/fefubuposimigarozu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/92155066496.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/3587289434.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d7cvvcp41c93ak8ggtvg2u63t3/16633081448.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e351cd7a19e981b2637362c8cdf6134b/gogusavijovorajimu.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/dovibugilajakasa.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/37091394477.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/tikev.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/varajuzevegamidesuze.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4789fd696d---97247166040.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/07c5906f52c4ff49048b56c8a255561f/jufonopemirematad.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/49gf02moqurajgadpnrj6bkt2k/lavofobavogunevumezepofew.pdfIn PDF document text
    • https://nadamasristorante.it/file/6231625924.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/wumagil.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/54318303348.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/tepuzano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ratib+al+haddad+dan+terjemahan+pdfPDF 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_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10788 bytes
SHA-256: 91c04cadaf955b84eeacd72e0a0bed53612bf5531e4f6f0f321b8a925dc216f3
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 24520 bytes
SHA-256: 2b92cee463ede7ecf5dd9ba94bc53b57658aa5674d2041c82c54bf85c9151146