Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c00cbd92ea6b94…

MALICIOUS

PDF

90.7 KB Created: 2021-08-03 15:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b131b5c96f9113e4ee4b690b1e759b8c SHA-1: 015bca471f241cf3bcba3436a9ef5dcf8041d2fd SHA-256: 19c00cbd92ea6b940e1fae0ec670c5d589c3c4e6ca7ef661ba0ce96112899135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=learning+colors+in+spanish+worksheet PDF link annotation
    • http://harissarantis.com/userfiles/files/fufimufim.pdfIn PDF document text
    • http://ipceurope.com/assets/file/49811743276.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/22252814834.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/57249854706.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a101633909bec635074d4fad056df0bd/kelijopijitupi.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/apql2dv6kf2fahagjtj41r6np7/57167939999.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9ae19dcda9918e09a195775e5c58d63b/vudizof.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/c76u321dqb866f1m60pqu7f1fk/fejekunituxovuzud.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942fcb76914---11947757529.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607604fa9e9f4---kojubapi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610905f5b7eed---dodepelijimow.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/fizopovonuvowub.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/c5hlcr0j4mn05npo9nfcmmq278/88603739993.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/27888288000e7df04c3e88df6ccca4d9/58860538886.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nfnjh4urqh0p3ccq1mbp1c7ii6/39689579564.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/kodezaro.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f9d0cbde9---32483761879.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/bokufoziture.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210620172838.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b449844028f---zitoma.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a80b23a7e692592be7b30cf975af8f29/80837605892.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/23771449746.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bec43493487---medumujazerepusugizup.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_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10788 bytes
SHA-256: 10b6ba1c5db449df717795dd193b7bb3818060a04ad19b1657dda7220949b2ee
font_01_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 16808 bytes
SHA-256: 87d4a208d670e7d1c26cc81d5c941921a43a5d1d1186e8b8a8c97f7f13c16bbb

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