Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacbbb267b04858c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 14:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e3759eac504a24284b34e0aba4f8412 SHA-1: e1f5e964536786401f32f83ce749c1a3a52ac9e0 SHA-256: dacbbb267b04858c307bb02c9a31941ef4a8a9bb98967af77b0549a4f1a2bbf4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure through its use of a link farm. The embedded JavaScript stream likely facilitates redirection to malicious sites, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The document body is heavily obfuscated, preventing a clear understanding of its specific pretext, but the overall structure points to an attempt to trick the user into visiting external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://keongracun.org/contents/files/34696807213.pdf In PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/97090223475.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/72305217946.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/rubisu.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/gatamuropubozokamefopitiz.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/63670565192.pdfIn PDF document text
    • http://snsi.jp/image/news_file/15943700640.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ee61410e---tovuberada.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/89884691387.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/xulefawefonakoregivuxopu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeff169cc---94849324066.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/joxopiwaxasa.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/25255397826.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mowukolarojapifivawe.pdfIn PDF document text
    • http://saimiri.name/upload/file/27513023935.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732c2532d6---99665544277.pdfIn PDF document text
    • http://ibb-online.ru/f/file/39823176213.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/10883412050.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/texaxaxu.pdfIn PDF document text
    • https://kaparatt.com/images/File/mozajuvakor.pdfIn PDF document text
    • http://zerosquareonline.com/file/96084674744.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/dejobelopoliniti.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/63381336819.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3cd44ead---fuwogofabubelawudutoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=third+party+library+androidPDF 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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10404 bytes
SHA-256: 40763f30e4dbc0ca0095d58ac1ee315ecfebdf1f289c306b3da80fa43582d042
font_02_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 18788 bytes
SHA-256: 02d9c0854c7d9655e5e3f380437e74e0fdb89663d66b89acb44f0f501625a476

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