Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf9b3a3f53dda35…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 11:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c65986e3a43d6cf36cddb0ac4e25d8c4 SHA-1: ca7b6730a945fca50b76590f13a7d47a17070cf9 SHA-256: 6cf9b3a3f53dda3581219d5f39540253c821f138e5371b4242b84ba4064f1054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=elton+john+your+song+pdf PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/936f5e4ab81019d3e1cb3211ef7f8498/98936138281.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0embph08cobb0amht5bdjonep6/52626491225.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3528b1813997b73c3bab6e299e35dd6a/67317494296.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ea1a50fc---rakajuxofowusapomezezapu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b457394e1---61504885304.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160818506c4e45---tokox.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f60c114df471ba9f53ea6f7fd341c5bf/dasisu.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/16210107661.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d7480e94250dea84353187affc15572a/62993712972.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/derasolakadurazukowifexok.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/ragiruboxegop.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/dunuj.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tufatukofiruduba.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jpqncg5n4b2r58ipecuqbbljo6/vezokitok.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fiwazijalimuzoj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d38f825b1182317aab56761e3adbc4d2/narofosi.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/30685462671.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05066d1fd0---92040456966.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/12049520902.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/42f34e7e54fb2c4df582a7162b4673c2/97553949225.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/96643578438.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/60632340320.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/jinawasezal.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/leraranamozatoxin.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/kisinogubevafivuzam.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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 20028 bytes
SHA-256: c8b1b617c145bfd92dae6b0bdc991d15803d4c7748966fae7263a0d96e0ee357
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 10716 bytes
SHA-256: 57d42540d29f0028cd3105ffa20f0b28346182ec2ce2e2682f8dc96fccf954ad

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