Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6bc0482983b97e…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 04:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 793a974629fe6a9d721c0c3d2701adf9 SHA-1: fdcc4dc249a3fb2e611fe8e58ab98539da07f570 SHA-256: 9b6bc0482983b97eced0ec418db1b5bc26ac7d98f8e725bf8fe7c44dbd4c75a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=mi+tv+cast PDF link annotation
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/23137935853.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/46555977391.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/jewebenaroli.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/51158669733.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/50859552223.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161372b85a34fa---30874313346.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/mefoludizefutajuzep.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/74516189692.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/49483078064.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zukamu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tevutozu.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/57260888942.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/ligemeretafi.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/48656735501.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/kibavedigofagidogabuso.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/xudasokitila.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/23768381224.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135c021566af---43569143418.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf5f21a62---52226925461.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/takezafasesun.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/21121796557.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/23493488606.pdfIn PDF document text
    • 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_off0000bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 15588 bytes
SHA-256: 11397d9e987db6650b412f79e5a1f80f1fc1ff833fa3f1a3b6b2e02a75fc43d7
font_01_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 9780 bytes
SHA-256: d0d03975b59a85363581403b78760af502dc7f25b9657d9376118b2aef7b41f4
font_02_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1