Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f98abd89dd3cae3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 01:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40800de570b89dfb4bf05618d88bc64f SHA-1: b0099d225e4229fba649da4684158a620254ba7d SHA-256: 2f98abd89dd3cae34b93319e8a0de4ef744e5d22be22433689934d126b3972a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'link farm' heuristics strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab38e7e6db---luvurajufokamesesixetedin.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327adae5fd---pipewofuwumitesorijo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/75712084662.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/wotekufafufufetewu.pdfIn PDF document text
    • http://freewest.at/63965018174.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/25118106977.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dcfa5f00c1c9acfb492041d9e26535fe/nolofo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/18612520268.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/81558470416.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e591648a---pugonuwuxumijufumejeb.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095295fcc504---rokotobilelazavisiper.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/40274785720.pdfIn PDF document text
    • http://trivio.it/userfiles/files/56085388085.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/nunubigazusikuluvavor.pdfIn PDF document text
    • http://minhanh.com/files/vumepiliposito.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b545a4efe29---68680384269.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bafumubigopuzo.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/panevosibat.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f354f7a8f9---vawazitujakonajakuwovoma.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/34618916910.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zazaku.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/moreg.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/8b2335feef68d94a0de30c45610cb7a4/gaterep.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c32b73b8---gopipojesanaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=transition+words+worksheet+7th+grade+pdfPDF 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_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 10920 bytes
SHA-256: ceeb325bcbd106a804da0f4e4a78683e6d60200c2f904eba53f9f063e08df187
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 17820 bytes
SHA-256: 6edcba5fbcbf0656386c7cc05a08ce01c5bb78bf9b6f9901eafc1c09001e28a3
font_02_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1