Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7748e12e8b23721…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 20:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53bd853e6f93530cd11d86bb80158854 SHA-1: 409f0dfc8b6241ee2ec2cb2486d14b1cdae0a3d2 SHA-256: b7748e12e8b23721083c8c6254b81714c4a209a76f03d3bffdb18539b1bc739d
156 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming its malicious nature. The primary attack pattern involves directing users to external, untrusted websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jaurrieta.net/USERFILES_JAURRIETA/files/dexipasejufawu.pdf In PDF document text
    • http://ohmamakitchen.com/uploads/files/bikonatomug.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosif.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2696cadcf---kamirozogebugikubosu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/67524946183.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/bexoruvubawajirusip.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jl4a7p8na7atlv179e4n1264b0/16173946016.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fce023ec5---litilivisi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a288d36b5ba---lekebuma.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8fd64d7b4c7726a4cbd7abf3cec2357/bizuselizumobita.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cad1896d8---91869909040.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/sexurunemakerofuloket.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba22726a5a2---36976385912.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/17681685946.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/308ef3dc6aeec5372a3ab59f721879c4/fubolutogexofomabagin.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/takukogodex.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/57922795684.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/vetirejemuje.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aed40ebc1---62465204136.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210803_0D8725AC034925CD.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gavuguxu.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/37390720164.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd24d69ed---57870271588.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nagotuvisazarezibodas.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7ad5a4416756650838f88fd59beefda5/jeretevonokufokenomanon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=differential+diagnosis+of+red+eye+pdfPDF 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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10788 bytes
SHA-256: d6d34463217ef271731a67391613d0e27066255ac031c9ecffc86484b39c7292
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 21896 bytes
SHA-256: e6e60447ace99080d42baaa3b7366df8d63b3bc0ab0cbc006d043fce50c02812

Open this report in the interactive analyzer, or submit your own file for analysis.