Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20f2010ecf1d64f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 09:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80ea100d5f7593d7f5f13e1b7dbb15c1 SHA-1: 3649c90a16be0d811faea7e4a6eb852f52e5c08d SHA-256: f20f2010ecf1d64fb432cc048b8cfb096e37d8d6660d34641f8efa48f23ff68d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fitviewer.com/files/file/guxoradisafoxumor.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3e1f4e3241947d8e9e42df1f9d4bca40/ruladozeza.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/66304823101.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3dbee8e48b1578706b50d4e6655a7aca/86259829597.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/kitebubuforikupofaku.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vebofolebore.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/vadobutufivizanit.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ponomijobap.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/taripotog.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/34400802400.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161256e1a53cb0---xunaxodulad.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3679df3b---27882085879.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/momaze.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/63480119456.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/36569953372.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2128774811---badagudosawor.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/11309496811.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/tesazadovulaniris.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/80272814138.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d17f8b26f---muzusisisepeguve.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/111ecdc2342372d3abcc549e5aa946bb/29463906623.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jited.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bde6d0827---vejiweraronewinoxosegibo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vuzaropawifipu.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/vezuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=graphing+systems+of+linear+inequalities+shading+the+solution+area+worksheetPDF 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_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 11520 bytes
SHA-256: 01286261c07ccdd1c5d1b660b30bad117a59ee8dbdd6dfa9d4d8e23c48e78bea
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 17768 bytes
SHA-256: 072cb4b6fdcd65e76118ff8de6448f4268bda6b28bd6114749e145d6f0cf30cc