Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f843b6c2f52801…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 13:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01fc62d25603a3978ec00adfae8e2333 SHA-1: 9b56617f862fe3d5e4d3f15abad8654b3931b4c9 SHA-256: f2f843b6c2f528012618a1eca4e17e3278cce10cbf3a21afac5188a5ca065d7f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bimetoor.com/basefile/bimetoorir/files/dezovim.pdf In PDF document text
    • http://scard.vn/app/webroot/uploads/files/4011246105.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/71860109511.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071356c67fe2---jegigabegumowepaje.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/62232536261.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb9d412e65---zewaxaxasikum.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210621_570F61556AD2B9AE.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/18570820224.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/87723837688.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/gisajileladulisiweludop.pdfIn PDF document text
    • https://wecareprogram.org/images/file/56256432952.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/10159949717.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f98a5fa58---42684191047.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1b797a517aa2d4f6107cc9233a610b40/xuwoziverolo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/71584229404.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/703fb58f581785fa314870d20e2e2d7f/tozodu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160dea7c58d061---47200700154.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f4a6c3e8baf118196a23f9dc96cdb406/3293948824.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f5fecfbc8ff8654962d0aeb00c2248ec/welosozigupujopiwezaza.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/81415733659.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16116da98c823b---dotedesegepigun.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092992839e39---45970437765.pdfIn PDF document text
    • http://kunbot.com/upload/files/64743745817.pdfIn PDF document text
    • http://kudusde.org/resimler/files/26167932135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=surface+area+cone+worksheetPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/69051773098.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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 10648 bytes
SHA-256: 673babd17f625c76169f32260b9eb182b3f6de352622c7a3b076cd28ecf41680
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 18756 bytes
SHA-256: 763f4d470c8493e5e9f4d4443a1a34e10e4e5ee80c24ad2fe05669ec1bb1bef4
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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