Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7b7b066aca0190…

MALICIOUS

PDF

74.1 KB Created: 2021-06-17 21:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a46175bd2a5f9e9ceef0fdc752e08a7b SHA-1: 4efb61f241aa7282974b56edfe23ae5a7fef74b3 SHA-256: be7b7b066aca0190241a3514b5a356b72c3a6360b0103ebbb8f9d780dd8c12dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate the PDF acts as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2e1e80dbf---91460145569.pdf In PDF document text
    • http://richmediahouse.com/admin/uploads/file/tofijebuzid.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/zevumatuvuropawi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f9dbe838aff14e0b6eb69b2edd13b3b3/tapiduzimiwaba.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l4g5hqg63ljsc44pqj41ngl6r4/pujemo.pdfIn PDF document text
    • http://yejida.com/userfiles/file/kovevaxoviseferigojeja.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/defawojuju.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801d699989---26058364423.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/onoqjca9ml00ejlpsg6dalds17/vopusuk.pdfIn PDF document text
    • http://schokobrunnen.com/idata/wikefive.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8fbe7a99e---20322990977.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/15608742758.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b013cff214e---63870723711.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5a4dbb9d---fojavevibemejitarirobij.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/99842479976.pdfIn PDF document text
    • https://schmitz.cz/res/file/nofemap.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e8b2a4451fc2436a2cf0fbe7e1decbf/vixisiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=spawn+artifacts+arkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 5236 bytes
SHA-256: e62dd4e2d5332f853e8df4c5f4dc52c99f243ff80be203adb4a1d32e8895a12b
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 13500 bytes
SHA-256: 91dd08144003413cc58d7f47701fa95e1bb9c6dfac2de1ac58b290afb200514f