Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fb5d047e5bb9d3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 08:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d3030b9fff44f03580f42117b3bbd3f SHA-1: 14233c393bc2576b7719e03b62304dbd24fee8ae SHA-256: 83fb5d047e5bb9d3d5eddea0a64556b9ba2abdb5ce9c16e1d7777d9b52eafb05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tlumacz-francuskiego.pl/userfiles/file/pavexawawuz.pdf In PDF document text
    • http://wedooverseas.com/userfiles/file/14500224136.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c2aac90be1b600c88ce0cd0b5b3797a0/tavuriviji.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/masodofun.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/50540880371.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/sixeruxabusado.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6144867514ba0.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/pifalokuwemebejekerego.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/gagid.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/pasitibejubovoxoralumim.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/64162977006.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/19195657559.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/79664029857.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xuvidekuwoboz.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/molax.pdfIn PDF document text
    • https://e-midas.ro/files/file/37783955373.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/nativ.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/57977713888.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2fccb972fbd7e4bad2025be3022816f1/pelupodet.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/10964671091.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/wopikopi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b14503e4e---35140665467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wear+os+vs+tizenPDF 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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 18692 bytes
SHA-256: 0dee9811d2f6eeecc0eb04ff9f6d7af9bc2a91b4d945848f0fc05d39bd3e4c6c
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 10172 bytes
SHA-256: 1318c949d6fa683bef9798ab5a0a2e848e5ce9b4489cef089a1ef15d015f6b42
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1