Malicious PDF — malware analysis report

Static analysis result for SHA-256 9215c23a60d3da22…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 03:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8457c2e3b17696a23cd8b97765d353f6 SHA-1: f89a5794a4afc3b901e67dd98e5e39ba108f338a SHA-256: 9215c23a60d3da22e215fa3ebd52b72c4b1c38028f276e31d0172d647b179bdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. The embedded URLs point to various PDF files hosted on numerous domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://termofriz.rs/files/63911161146.pdf In PDF document text
    • http://likuidart.com/files/ckeditor/files/40356051935.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/dizuxujike.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/61536359905.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/87800969815.pdfIn PDF document text
    • http://gekon.net/userfiles/file/guxiteba.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/80509585079.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148929912897---garetew.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/tapuxufoxepafibipitojuku.pdfIn PDF document text
    • https://avenue102.com/uploads/file/55349994026.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/rabuwunamapimiziwifo.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/diwunetomo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kodunimov.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/wubupo.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/6706194484.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/xijanebovolikawamen.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/38930626543.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6bb433815d6bfc8c30e13a8a2530372c/tisimupatigavake.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/8120000602.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4995620d47600b6276a422b8d89cd6c7/28770995793.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/xarabadatejuxixuluzodivij.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/tukefanetilusolur.pdfIn PDF document text
    • http://innotack.com/userfiles/file/siluzexejegivoterewodesi.pdfIn PDF document text
    • http://spiregene.com/image/files/20210920_150322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=internet+download+manager+download+for+pcPDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 15792 bytes
SHA-256: 20362ec2919512859753211e3035a14cc99fda4bd459a37b4dff591843ec4e69
font_01_sfnt_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 10740 bytes
SHA-256: d00cebee7c476b7909718c36e8a27cc732c36acfc7017cb4044a3dfd23add40c
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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