Malicious PDF — malware analysis report

Static analysis result for SHA-256 209687fbd4640b6f…

MALICIOUS

PDF

83.1 KB Created: 2021-08-15 11:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9e3865d52fbdc9e22d5cbed0ffa7f21 SHA-1: d904b5bf4648e926ef5eb8e49fc772cdfaf4c927 SHA-256: 209687fbd4640b6f766412440c5fd1a602b4ebffab94d6923330a53f30971e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://chcial.ru/uplcv?utm_term=who+are+classical+and+neoclassical+economists PDF link annotation
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/5oenumdu4mrnlbci5gg56ge5sa/21160832390.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/57503663589.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/20773233486.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/fesikam.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff71ccf793---52625199701.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sofararamafa.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/bokup.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/soseluwufezajabirekidona.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/meruwefibogixesibevarikak.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec36a756e4---43506083290.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1755a0c62---gukil.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c773b79acf2---gijagelabuzuxima.pdfIn PDF document text
    • http://dentherapia.hu/files/file/21676156564.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/2fe0f0d795f0d27518da372021e2b2f1/puxigonenanuvemodixijo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c15963676---6500281187.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/lorixova.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/dudikosemezagewomijupav.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/27139668176.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/woxebanusuwi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6l2vpti0ul0brf12saoo2o43aa/zofupoborewetodijorebomif.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/484a26e317fec5da2e0a8c87ad6d08a5/40451758476.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/43636602428.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/16330254823.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/96434799340.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49a3053b2---36259747010.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/fitoxavopadugamenelagak.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fln12kifs5bqvlg4flm3tlso26/gegisavuzezosidapeku.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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16896 bytes
SHA-256: 47eccabcb2048d35ca61bbfed7105f5e34d8a44c6044edd2ee03c1166dfeeced
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10628 bytes
SHA-256: 0e194b61f9d04753f00463a9bda3a5fb0b52aab111cb03d0627f80c45343824e
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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