Malicious PDF — malware analysis report

Static analysis result for SHA-256 4736d518f067a6d5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 18:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab019214e1ffd69869e22069318340e4 SHA-1: ec76ab70a232f6ebec9d616fba188389a18a65b8 SHA-256: 4736d518f067a6d5320b892fd4946b82fc171dd4a2c06d5d6c41949f1a188afc
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised WordPress upload directories, suggesting it's part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://stringquartet.biz/web/images/fck/file/23956783334.pdf In PDF document text
    • http://mebco.ru/images/file/67231612178.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/moxurekebogoxukokoba.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/11361723838.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/231649113205.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbfce12ef3---dimaxiwef.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nrrd9f83ng1v00sjrjbncdetj6/pulifesokikib.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/23785702713.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63823d900---tivanodevil.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/513049460.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/bajagus.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4c3eca8dc0dfe1fe1de631560658c123/lufix.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4uhpru54fena6eqlvfpmgogpj6/34286063716.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3284dcd9bc---somotumelulevugidadowidis.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xafilomebu.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/gerifonuwof.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/42947935578.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072264a6b992---29425385313.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/nuboza.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/paduwevegazupotufapamame.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/45e04d55b995574749d6110a60128324/10882377260.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/57814122261.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/jokotirexevasi.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/mojipesolidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quiz+and+answers+easyPDF 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_off0000bf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 15944 bytes
SHA-256: f8b2d0eba96b5b8db1542979460a690fe31a35ce3be28cf11f2a27fcb4ed4928
font_02_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10396 bytes
SHA-256: d3308bc93f3224f99a2ae7802bfbb8d27f0e4b42c15aa1047fc746d7019f1a93

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