Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f96b59273e62a1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 23:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b45736343f80fcb87854459c6c09bdb0 SHA-1: 63f241695ab9f8e1b4d47c95ba337d98ee510953 SHA-256: b1f96b59273e62a1cc76c8ac609e0053e59bb4af9b244d5d48536aba734107e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to numerous potentially compromised websites, many of which host PDF files. This suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/23cd09b0c39808d1b83664754468df10/fenuv.pdf In PDF document text
    • https://morganmethod.com/ci/userfiles/files/19339718570.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/73709708665.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e4f0a0ce9c1eb5223f840d1a7b66c6a6/36540846777.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/29080112998.pdfIn PDF document text
    • http://school15-tyumen.ru/f/fovijutusulobuni.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608339943cc30---88985308501.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/83465494155.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/45686690725.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/tekurex.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n6eonpq8eddgleqjmqi56jshjq/87208187026.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/34843101934.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xegowonumawovesodo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/19a666b8c8993b8c7fbe32a164a8197c/9916276811.pdfIn PDF document text
    • https://khanikango.in/file/rakekuvopuwufuririsuwed.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdd9b1b80---78539150967.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/2888037715.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/93341072541.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/4157355226.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/88655834204.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/modinasuwab.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h5ar177d5ab57qav70jj6mco03/93174351605.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcda1cdecc---79308333869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ge+vivid+7+pro+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 10544 bytes
SHA-256: 242f748d69d96d5d8bad821573314001a839e010d116cd9e8d71339455c6bdec
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_02_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 22488 bytes
SHA-256: 9e26573ed073216aa0c043ab80b8c4e240e3aea25209e95dae0649b156bba817

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