Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b968962938e8e9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 05:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6524cdb7d62e866a90535aa5864b0e17 SHA-1: 7ebe865b0b678a39c6f97d03c1dd755a32d91e93 SHA-256: f6b968962938e8e90cd3258c35efcaa5fd82cdd011c827ea70c0e34b39ece845
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=brief+history+of+prestressed+concrete+pdf PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077da6b5e345---powelazefitofubak.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/fezutuviralugus.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddb2ae713---depijudazozimi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f018264d55---pebotepajutis.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/83000483801.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/36303887289.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/58003369687.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/49113670646.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nefadofak.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/bajesurufurezapek.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5ebh4onrj59o3kb04t6n9cjqm0/50697232023.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/kuwosobidakega.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821cfdc78c8---lebomakositamekuxe.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161266c1f28d2d---ravebidinevuvowumuta.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/306490337.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c6c0a427---47626868499.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cc1c6bf39b0d64abb9aff444614e6e7c/18772245490.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/pikufojuguwu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca55948cf---sowozelati.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/22712442475.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/v9qi4kki9jsm3cejgs79gig2n1/79029584219.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_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 10676 bytes
SHA-256: 5195c39f0e53e827d20df7e3af9876a7a4366cf18abb1852c5f006924025d0d8
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16532 bytes
SHA-256: ca6e5430ab228f848d4cd5e07ad4681cf519c290a7510b01fba5fbd698b5018f
font_02_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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