Malicious PDF — malware analysis report

Static analysis result for SHA-256 b469337a28e855cf…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 06:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2b3618cd2795e38c78b755ceed6b33f SHA-1: 620f678f4c51efcbea08a226b5d1b4ae35b11052 SHA-256: b469337a28e855cf7cbbf8fcbb7d1e155324f36838333af0e482ee7977f172e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised CMS platforms. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The primary attack pattern involves directing users to potentially malicious sites via these links, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phukienbep.net/media/files/17922076533.pdf In PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/49746618794.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210819105551526.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/1288914560.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/19277021001.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/69471571148.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/67709398166.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16105d23fc9edf---zukupilajoka.pdfIn PDF document text
    • https://yuktogel.com/contents//files/kuxafosez.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/7d47ee9ac30e64ab3d31b7260146b333/ginemabekojozofir.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a865f818a05---69109718151.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/pukowedabuvasupa.pdfIn PDF document text
    • http://word.mn/uploads/assets/4395891135.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/61741043309.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/gosebisibujejib.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/32161297723.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/96668186618.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/19ed269beb90cb528bb13810cc984802/femedimezorajeludosupun.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/51767589055.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/31361184952.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/64409945567.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/50209614595.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612762c5e213b---96273012980.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/53386568914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+printable+fraction+worksheets+for+3rd+gradePDF 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_off0000b0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 14436 bytes
SHA-256: 86abd660fed05469d173facbb0b6978156c8fc3df5b6eecf9dd56c35b905c613
font_02_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 11368 bytes
SHA-256: 799e4aef5e73d7c827943a7b602232958d51299d1d948d8fa491c6da437ffac4

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