Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc98293e93f72d9…

MALICIOUS

PDF

87.4 KB Created: 2021-08-01 04:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1137af0299a6c6e5300f53f99068be2f SHA-1: 8c771995b823b0dcf89a57c54dc72d640aaa05cb SHA-256: 4dc98293e93f72d903d38c7265ed9a310f7fa87991c1bb417a41d87e2eefb3f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://asiavent.com/UserFiles/file///13547455525.pdf In PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210723_EDB49757BAF59F38.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ee286618---42159601847.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/xudufakabefimuz.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vakusuf.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4vog7d0uh9gvamftin6ghe9o5n/bewowakudavovejejow.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/dobusivegapabusej.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/87618682984.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4cs6an65emcilije7pnf48s1ap/10843958810.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wimenewadowabirapikotasis.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/28401431822.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/kigemaxepejelozoxaxi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7fdcdf9743cdc5d20e6ef6b30cabf8de/zebadofatijudugotubus.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/65187468946.pdfIn PDF document text
    • http://princeverma.in/uploads/files/merurasujevoj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c87fdead014029e31cbd63a934bcbf9e/85358901262.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e97c7633---modajefawomiwonewuza.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7cb0a5ce---vamuxixitovuta.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/70567480999.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4f3965410c4e4ff30a10ebd5995b4d23/96705134800.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756fd767de6---tisegedo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ac31d843b76494875f6fecdeb1fbf970/fazefemixilelatezurebevu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/736b8d494a7aca4c8e8e4c38b90cee87/23722227721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+prepare+for+an+hrbp+interviewPDF 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_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 17188 bytes
SHA-256: 2afeeead321c4903920e5b1718ed50a40c7d72b218f024e08f99941c4d373d11
font_01_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 10524 bytes
SHA-256: 791fc2a48da053d639c35baafb2ccf9546b414a1a1aa776951bf403d3995d04e
font_02_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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