Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb96432dd491759c…

MALICIOUS

PDF

82.4 KB Created: 2021-08-29 02:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b9826ea056858939c3cfa1e3d8b93663 SHA-1: ce654d09c2b2aa778b9d759868b465a5358787b0 SHA-256: cb96432dd491759c852180a803b0ea7abae85d73168e5cc6dbf8db4ca606bb1c
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=wake+county+map+with+cities PDF link annotation
    • https://miet.hu/kepek/gatezakivesusegonol.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bca81ae7a29---wuvekenajuxaluvopegomodo.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/62930531833.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/88f76f6891f05e78e9fdc50af7349b64/sefew.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/kitewumaluwaje.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/73170683908.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gujuperajabasuka.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vasoralakekofulaxodenuke.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/guknhvblem1eguuvc9su7a6vj3/13007737613.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/soguz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97bbca1e15---ditiguzukob.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1096e9a67f672e70ed828aa833ed8e27/dupovinafa.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/18591190503.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/q9hl0g499rgem60s8q0c2k6nh3/31889475731.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6a3b0cca5489e88ed1d82a4bd9cce99b/dikalizogodimerilixaf.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210624064523339.pdfIn PDF document text
    • http://boxethai38.comupload/file/zeludanokizelefadogipi.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/38120969210.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/9492576526.pdfIn PDF document text
    • https://schmitz.cz/res/file/86869530833.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8b480ec8---pogasebadil.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/08562b90adb5d96c9fe80c789c4591b8/xudaxumimekavimemelatuvem.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rirojozuvaromewuk.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8f486ac27b---xafubimetinubi.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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10880 bytes
SHA-256: b34774de15e16d57f64eb7f98a052f185cd7b894b45c55fc6ed2c7b02cef31ea
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 18292 bytes
SHA-256: 22945ac2a7ff9df3386c89ae934a18609933685625b0d6fab3a35691783ca3f0
font_02_sfnt_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.