Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a459b44b0653cd7…

MALICIOUS

PDF

86.6 KB Created: 2021-07-03 03:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 826a97d1abfb6044776b6d89eaf900c5 SHA-1: 5f054083e7dc2b9e02603f00784ff78c154e4e2c SHA-256: 8a459b44b0653cd707199bfbdef5eda64c5aba174e5045d3c67f5b2bb06fcf4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

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://medvor.ru/uplcv?utm_term=thomas+hobbes+moral+and+political+philosophy PDF link annotation
    • http://funperm.ru/content/file/tobuv.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/gegeziga.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b05381f0f51---88278286981.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee98aec5d5---91282070856.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/40283272089.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/it391mhq0g2n8gmijiaovu3k9g/18668218471.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/76385749820.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/30a4c64e7bdcc6090a86cbb2fc7a0fe7/zemurilifiguwulared.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/91089234312.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/17576530463.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/badarurelevoradunema.pdfIn PDF document text
    • http://krzeptowski.pl/file/15909226810.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16094208395b5f---98902121593.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/kowutavepekigodava.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/lipiv.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c3e543fb---votenoje.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ovfa3kmah9a9o4dhq9chf8n0p5/20511176847.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e1796d99caeccbf3c1d7ae60ad424de1/72748945923.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6090cd6a0---35997267644.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/93147250838.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/96821376999.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/ditiman.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/sezawamenekorutimovow.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d83303a3fc---95059438185.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/lanofemisifagis.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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 10996 bytes
SHA-256: f50d0364fb097f99a7b31cacf02854b8363c246d7e1c03d2beec7e20f03297d1
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 17464 bytes
SHA-256: 5fb2e10966ee0753176efb8360a018cd3083ac7465e085702ee4d13abfa27cb8
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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