Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce4c9d136515726…

MALICIOUS

PDF

83.0 KB Created: 2021-08-13 11:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68b49512d1ccbd470a9e75bd49ea3d96 SHA-1: 9a443aa5f10e4439e22bc44661561a949cc01d31 SHA-256: 8ce4c9d1365157265d8cf43b29d53f6b0e4bb8188b7da7588a030f14fa56bb46
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, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the PDF functions as a link farm, directing users to numerous distinct hosts, many of which are hosted on compromised CMS uploads. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm suggests the document is designed to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://timebank.ru/sites/default/files/photos/pagefile/wutufuvakosawasekike.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160df88abdd7f8---3653712848.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/gosibirubuxazaranazowelan.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9f6fab6910b64fd2de04be6c4ca537a0/vumotemabavijozaxumuvizuw.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/gefaburegupesusato.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/jusetedilatudejokeke.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160870f52b1451---62932287308.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c909d8a7d5d---71284775617.pdfIn PDF document text
    • https://mavibusiness.it/file/3861219054.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lazena.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8c821605d5a43e2cc32fff60d4d45106/pogapo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///98220071728.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160984d0995e2e---bobovekuzusamanesa.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/nenul.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/43242994815.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b709ee9bb9a8a227c798258911c12d9e/bajitinidit.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/ximawigites.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/ruluposuto.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/17463383571.pdfIn PDF document text
    • https://luminex.pl/upload/file/52198571279.pdfIn PDF document text
    • https://togeltop.net/contents//files/dasigigebaxagubowazefaw.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1c71ccb19333bb2381c9cd0899ccc6c8/14080374013.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/u446ek2vohvqv1k82kqm1mhql2/81599917548.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7eabf88dc9cb501dceea859109d7070a/62545898917.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742803666a2---4399590081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ingersoll+rand+up6-10-150+parts+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 11204 bytes
SHA-256: 01fad165c54789f735882c47db54cf065bd8725dd01b2229f5163c76c0329133
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 17224 bytes
SHA-256: 16ace0e69c85700ec37aee1a5a456c4cc45bc83e66c6b0db40594b38b602a82a
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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