Malicious PDF — malware analysis report

Static analysis result for SHA-256 4619a31fe5e76833…

MALICIOUS

PDF

81.1 KB Created: 2021-08-15 16:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33060fe05e2aa578a9b0e93673e1c612 SHA-1: 1c3aa2a9312025b423ff8a85e6b2d27db96ea628 SHA-256: 4619a31fe5e768334f7c0b9360f8ad69d431de6c7642ba8d73a7d192401d3b76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=cu%C3%A1ntos+metros+cuadrados+tiene+15+acres PDF link annotation
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c460b999a---zonoz.pdfIn PDF document text
    • https://ancoraeducacion.com/images/gelolopovogedawoxozimoza.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/70920031651.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/sugarejogejosoxeluburog.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/15256167817.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/46860992776.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607806325f345---lugobaxibetek.pdfIn PDF document text
    • http://wjcopy.com/upload/files/69422541104.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/86636688550.pdfIn PDF document text
    • http://kccmaul.com/files/files/wulamujebuzovetimoposem.pdfIn PDF document text
    • http://envida-nieuws.nl/bsb_website/upload_fck/file/43477777798.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e3374284---32567152603.pdfIn PDF document text
    • http://iltorg.ru/upload/file/wapawukakosavizi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c5757ed1---pifazezekugiresawopumavu.pdfIn PDF document text
    • https://taperagi.com/contents//files/tekagonaga.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/plki1a8kktpvgogj86gp1u6132/ribapof.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d998087a4---taner.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/buratedere.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021522751462163.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/32728174451.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_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 10984 bytes
SHA-256: bdedf8bef85236108b6a20968e40eda446f7dbff96a83bcfe480de4c34c53e1d
font_01_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 18992 bytes
SHA-256: f252556c6385d532e5d08c60f999dc05e9786ef805d20adac3441edd90982d27
font_02_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1