Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed6f3c8b139a6ae…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 12:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fe0aa9ee2ed8c75ae9b7a1b22cacc3b SHA-1: d93e926fbb2434df872f8fc4b982194c9a1ad717 SHA-256: 5ed6f3c8b139a6ae4c2c9b48e7523db739e3cf26854dea5a32f494ef26d7af92
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a link farm and a browser extension installation lure. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of these indicators strongly suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://duoctruongxuan.vn/userfiles/image/file/xotobizizaroro.pdf In PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/47789092451.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/81150567157.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6783a0234---refodi.pdfIn PDF document text
    • http://demkapi.com/resimler/files/vutitoniraviwulaju.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a740ad0ed1---69017850222.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/28179369130.pdfIn PDF document text
    • http://wirheiraten.de/images/file/tavop.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/bizifazegexi.pdfIn PDF document text
    • http://coffee33.ru/archive/file/87296548037.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/77328492886.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/46910990593.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/xoxavipijuxaxu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/66497822335.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/jukogakut.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/8688210371.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355bfc8c7ba---25882921977.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/kowuwazu.pdfIn PDF document text
    • http://sooclose.eu/upload/File/17745257519.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b58772accd5bae7cf495f06e0258f1a4/85144163797.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/63908502314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+show+data+usage+on+home+screenPDF 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_off0000b8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 17568 bytes
SHA-256: ef6ba840b933bf19c9bd137d9c94db7687a1c1f1d4def9c85b9555a65d34207a
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10856 bytes
SHA-256: bcd405bbaeae04f1bb9fdbe27858439abeb62a0a7c9e1a21d046324479ef6b96

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