Malicious PDF — malware analysis report

Static analysis result for SHA-256 9862405bbf0747e5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 17:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f611e2a9ccf3157cc0f8da3282a3736 SHA-1: e98f02a4fc51bee78c8eceb8b671301af451a7dc SHA-256: 9862405bbf0747e5d705f2f01d35f4c0aab35eb46959407c04d44e4c470ece40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=industrial+training+letter+of+completion PDF link annotation
    • http://madinaboys.com/easydo%20v2.00/files/uploads/64374784377.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/degojeleruzix.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/zosazakegisixozowojatosin.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/degaporune.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/xizomuxiwesozowosinup.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132116768856---leguzi.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/dojirazoneletu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/tevamorif.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/romafil.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161353747e491d---98307477961.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/88402199738.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/61268478400.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2ebba0cb8ee1e443ce1953577820fb2c/nijotigilorezurepagenot.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b391a058---39462124360.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/66004722310.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/72167005340.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/97595670983.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210905164939.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/26309229940.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16134959684cfe---89638831288.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/73211206327.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210915_145323.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/27127381352.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/182101114.pdfIn PDF document text
    • http://iphysiology.ru/upload/nupavivufotojine.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_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 17684 bytes
SHA-256: c8746e750ae00402bea165514f0e539e424294aea7d5e0492ad1a9a115a69a21
font_01_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 11012 bytes
SHA-256: 0c89a4e0481cc1074a354d754041e8398d42b95336ff661a32897b69d8402014
font_02_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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