Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b46deb0131221e7…

MALICIOUS

PDF

100.1 KB Created: 2021-09-07 16:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01cd855e3f475c8cf92a320afcebc375 SHA-1: 54c694ca92feec8ab480fde5361c7b3edad98b1e SHA-256: 0b46deb0131221e76e441364d895f434161db9e1044cfb8dc971b76d13938c2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=emile+durkheim+division+of+labor+pdf PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608634a48eb85---63752732381.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/jexabalajomunejifanataze.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/752a4c8d35562ccdee837aaf8d25a46d/gavujevunidopudexiveku.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/307154963.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7e48ajksr498eug84mk2jdgk6c/13970297458.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/99025866524.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/48a64f9376a2e15ef889df9f36159c88/72938117578.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2ee41362ec04417b70a95eda4c46315a/82573446429.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3cdbf009cef5b766a3b1a8fe394119e3/38206360071.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f70a9cf459ceb42b325fab4eeb3d9aca/xowoparagogugu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dck7bkbu8ks0jmqumuip78unei/xowitekinilusidijogusem.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zefexotiragisekuxowijafu.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/80420248868.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/11446105284.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/92770833689.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7404e3e35d34d18882115a90503612ce/sujedevidujaje.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/51253140382.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/58549097257.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/vj2emc69fe5gfjdrq3e2dronf3/88088283427.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/koxak.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wononewofi.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/dolifarigazarozobisekejom.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c0df26d6---36795524009.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o2lkdpgk6oetrg1j85oi6kdr97/lilenuvuwutebomuti.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_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 11048 bytes
SHA-256: 2eb432c36ecf631b9bc7e14fb0a4895adad238e4ecb9fafb2dc6ee84a30ff3ad
font_02_sfnt_off000155b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B0 17336 bytes
SHA-256: ec079f94106efd1b38418b01143cc1a63122354b3fcb5c24de1cc1cd42fb67b7

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