Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4a673d67a05a82…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 02:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da39de9117ab76f199cdbe1f68c6c776 SHA-1: 51479599b90cd6d43492b5e538e3092355e3afe8 SHA-256: ff4a673d67a05a823b74bd905ea73353057841f5db923e832a1e0287ce3d0e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous links to PDF files hosted on compromised CMS uploads suggests an attempt to distribute malicious content or redirect users to phishing pages.

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58dbfbe6---kejarotamubijuxopiwotupuv.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9bi9lmjgcvhs9oo4m9u2c1oov6/23730791450.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eae9e2b5---49120441126.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad415747c---taxesitozig.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/jidewalekifuvozewikozus.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/pifidikokoli.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607496aae0339---xenero.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c466624ebfff06f75488c0ebbfcc76ba/xajanexalebekitufe.pdfIn PDF document text
    • http://rld-carbon.ru/file/42685290278.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/mugutigoxanotajekinux.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/156e2a160c363dcb227ae9ac3ef5d5ed/wugaki.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dca2s7rtue0am8u3vdqsspnm1g/bofaxibilenupoboxigasu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cj7922hsphvgd7tc2oc0v6ldse/11476438678.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/vulosapigogututa.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/9969165314.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/64faa5139c395165ee2cf1a688de1e4a/90869091635.pdfIn PDF document text
    • http://chinalabware.es/d/files/37153321364.pdfIn PDF document text
    • https://x-software.cz/data/file/nuvip.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801277f26b8---wifovaxopimezobobeku.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/33469278366.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6aec71fd58547190c72a1cce0dca3ad9/86506712840.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/874j2inmg0232p83760ekcnr57/pawuwelezopuso.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be352814613---rizogazazejomewiluno.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cdc5bd0aa---pavitag.pdfIn PDF document text
    • http://fxmeat.com/upload/file/303a3679835e8ebc1308da8972180a19.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=two+deer+walk+into+a+barPDF 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_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 10352 bytes
SHA-256: 6d81c7c1863f0125c96c911b4ab7d85c32ce58d397c14e5aeff178a1b42b8748
font_02_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 16844 bytes
SHA-256: 1eb726ed24e59f26c3a3c8c2399a0eb3619ad239a8b459768f971191daed4b22