Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e9c119c730a0a6…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 17:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4098a1a8c19c5a9346cf2dd8bbcb864d SHA-1: d12fd9feff91d306d263ece16b8327fe3baad89d SHA-256: a9e9c119c730a0a6392cfbb864c4ca6540c93c2bb157c83549a49c9c18cdd6a5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious domains. The embedded URLs suggest the primary goal is to redirect users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=checkmate+chess+notation PDF link annotation
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ddfe799b---dumotorobexibeximuzose.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/500a29f041ca73e89495eeef5b7b667e/57314720989.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e9109759c03bbadaf7d36a0e20a60045/49528159549.pdfIn PDF document text
    • https://bamor.org/userfiles/file/zikevebeziwazejarap.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2227d8fb90---56356449552.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2100d91e4e---37156430254.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/69771256186.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pemkpbcu546phcka5fpl3fdae5/32220670286.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1924cc56---4259390383.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02cce70c79---pemamejurivim.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/63558159227.pdfIn PDF document text
    • https://abeess.com/userfiles/file/zegagaro.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b6c467c7273589e1b0615ee0b89bd15c/fokisekinikolewowibad.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bit5hopbbv66ni3fm371o2ei1v/gaxawepopeloforurovexu.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ccu5ae7a8vtr5cfkhokhcnfmh0/junatajasusarodade.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6371f2214e601a872fb2d0bdde4681d5/92374251443.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ddc1a56e5c51a17d3c9afa5f10c69076/2850778372.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/79753242003.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f800214062e5f34a3b5f4c4e5e66e56f/mupil.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/35239458103.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/supezutivubixukoni.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16083468b30997---pebivevowepub.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lorubajut.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/966a0eceb149edbc9ed9b567bebbc8c9/68951024110.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608021a2bd31d---lapunegawotuxow.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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 17580 bytes
SHA-256: 0cd226ef74c39b2f90f1b60c74262eb3bf1a173e5176effe717100d3d3449320
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 10472 bytes
SHA-256: 931f29628b914a7c8ba8e7edb9c1dce173798b1ec72816d09ee88df9c2cd9397
font_02_sfnt_off000136a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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