Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d0ab973d89e059…

MALICIOUS

PDF

100.3 KB Created: 2021-08-18 15:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f92d01489e60b8644ad5143ada608e5d SHA-1: 1c879abc3a72e4a65baa9c340db51c721677e10b SHA-256: 84d0ab973d89e0592c65d98016af1eaeb33da4169d10b6ab37fceb577b07bc34
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 compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it is designed to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b801a79cc8---nofumuvijo.pdf In PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/vujuzukefelokusepugulev.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/94142948319.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/fajakukubomotutijatot.pdfIn PDF document text
    • http://wych123.com/upload/files/73334239053.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/impipil3049orpt53h9daogm41/saduzikaxikasudejazox.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/movoparetivazepuvezotaxok.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bakcsocvde77ffebd474euptmn/44631877791.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5491e9910b---wagerefukijimoz.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0233be8eaf---10312955777.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c1adc2860fe179f93d61eb574834c74/kekagusigisojadipidivob.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbce5e075f---27482096444.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/37837748436.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///xotofekupiximutesiwenidaj.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074772523b91---manaderininilap.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/xumevujutetanozenejase.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/72d7920d6f509640931a8e1ba0ee48f8/bitotokogezo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1154da2459---kusexizoboxavozawo.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c745a310---lojugewuxumiw.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/popodijuximerixaw.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f1b22f358378f40f1eeda5db11202b36/kubusemapitupalev.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/gomokugivu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/36c493708ef7581f4364b547bfd461c4/tuvuwoliveb.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/11595811276.pdfIn PDF document text
    • https://tl-systems.hu/files/files/84265050821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+nature+of+the+conflict+between+creon+and+antigonePDF 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_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 11076 bytes
SHA-256: ba9f5e009bfcc65b4f9dd5db037b37fbf0e2b7cabc60b3bc79b0229df70e1b26
font_01_sfnt_off00013d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5F 17756 bytes
SHA-256: 8863d2866184577a7bed9438b900db116a6b6a53ee034c67ba9810c7a4ab22d3
font_02_sfnt_off00016a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1