Malicious PDF — malware analysis report

Static analysis result for SHA-256 2933033d8130ccc8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 00:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 780cfe20e0ad46e8c4719945468b9b7b SHA-1: 9ae472001cd7a8905eaca76670f9597323bfd847 SHA-256: 2933033d8130ccc8a90ce18c9ba67830bc6ec312ca33634c1604b2116099b08b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://bunny888.com/ckfinder/userfiles/files/84646821780.pdf In PDF document text
    • http://teakdeck.pl/files/file/dobawukagi.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/kafinobefafalosapurotit.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/85c3220d763e975952f8302a80ef1917/8816671322.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161342282462f5---rozataxoxiw.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908005135768064.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/1187121140.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/31054300701.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/34257113882.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xesinimekofedosoreve.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/dozivi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613210d253eac---sokeza.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/jofewugemimapajamujekubi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aa051c096---lotef.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/93287331654.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/xarigebupogekasu.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/23913767056.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/16592817528.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/ligofabinesegulugixupe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138051770df1---54332355827.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/wivetirakurijug.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/kubomijolut.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/36127200671.pdfIn PDF document text
    • http://belniig.by/public/file/konew.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8b89cefe---86918025572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+essay+writing+servicePDF 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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 10556 bytes
SHA-256: 3b28cc9fe36c73e1a1b7148aa96b7c3bb432cba8eb8d49d694992e703196e53c
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16808 bytes
SHA-256: efc285d486738b30816f6da2e2c1dd3f66dc4d1e191caf58c18b8def2fafeb31
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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