Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d12bba60614ea0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 15:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8748446575f26cb900daa7e511369ca4 SHA-1: 06312027dcb6199e2be429c30624ac8b8fa9afd9 SHA-256: a8d12bba60614ea032952c12c71131587b1cde0ebb1b8189ced32bac091f40a1
176 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm, with many URLs hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.ojchamber.com/ckfinder/userfiles/files/tifixuma.pdf In PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/21506203410.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/24735198538.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/wazogenofet.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/19867884159.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/zojimozuwitakifevajaro.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/18833962572.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323fb251b95---gazutanujoba.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/zunerunisapiga.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2566575---97720777000.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/4063845473.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/109815396.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wozomiwelarew.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/rokeminipizukowusaxodizef.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/texaxaxu.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/bilotofogejirar.pdfIn PDF document text
    • https://btegypt.com/file/57136986744.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/megudaduxit.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34283631425.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109110526335950.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16144663e06278---dolonaxel.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/witixisus.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/doxipesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=qq+chinese+apkPDF 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_off0000c3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B1 10404 bytes
SHA-256: d2b278174ed45c46edf8cae132e2924e0ffe848e91a2c2a34de28d477ca79624
font_01_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 22552 bytes
SHA-256: 663d069f6392a81699af7a4f954f0a65dd4434bc1fdd8804562159217f5d8c9f

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