Malicious PDF — malware analysis report

Static analysis result for SHA-256 30057adb3ccdf668…

MALICIOUS

PDF

64.9 KB Created: 2021-05-07 20:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86ede5a34cd50bb71870b4b2b4f781bb SHA-1: aee6efe39b5c95041ff49e62a0f6a0888899b2bd SHA-256: 30057adb3ccdf668b7a3225f0dfe46e3e49b459147faa101a279d28b705794b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4de6rlf0ubm8n92csagta7q16f/dabixatodemuwa.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf83c5795---7643140009.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l33s3n7iib92ojm66fedajta33/13709524418.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9c368a54d57a468e55fe4cf9dde7f3ae/wuxojudonasixiwunuvan.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf11627af---50623659812.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0f4buqonfgj9e2ppl9qg7hf8g4/towotagexa.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707aa6af351---39131717980.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9eb71dea5---tazunudojopobonosi.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5884e0c8---muxibevuvudumusorabeseto.pdf
    • https://unosms.us/userfiles/file/maxonomakezadowuleli.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f788be212f---nekukokawovi.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb5b6577c1---76504225856.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3646d3c5---mawozosiwosufevuxav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chogada+tara+song+dj+remix
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3a9.bin
6ec64f3991856c5d5c5c31817675e1edbb1042211d6cddd9ba11fbb8e7d7021d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A9 5256 bytes
font_01_sfnt_off0000d55f.bin
79d2516b456f551ba03fe57d39a4409202c8383d72a81aa7208953cd5a454769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 9704 bytes

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