Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32b94fd5074a972…

MALICIOUS

PDF

71.3 KB Created: 2021-10-10 18:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da6ff783f89842c3c7168650afa59e00 SHA-1: 5add8f6e421f14e9ed5879d69913eb1f8fe258f7 SHA-256: d32b94fd5074a972f4216e8a9ce0aa124cf1806fac494a34a6164d847bba168e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to external, potentially malicious, content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=fiber+optic+coaxial+cable+and+twisted+pair PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131caa4509ec---11138192342.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c1c950df---58405595164.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021104928305101.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/ratep.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/mebeneruforojotuv.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/wakawevolomapiwigod.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/66347796895.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/sisupezipusanidafoxi.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/finefeduw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e616fm47ie660aoe4ansuqhsf2/fivob.pdfIn PDF document text
    • https://petribax.com/userfiles/file/11361911206.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/xakutepuxonizesigap.pdfIn PDF document text
    • https://ultralloy.net/upload/files/godefabanake.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/wategozedawefobose.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/zezuribiweporakexegan.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/34513429346.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/kixesubiziwawisatapag.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/goxotuf.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/86304595650.pdfIn PDF document text
    • https://togeltop.com/contents/files/nozikide.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155d1ca029ea---25192371950.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/98932141937.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/gurudorujatemusafi.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/fezufamuf.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_off0000b517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB517 16180 bytes
SHA-256: e1e42131b47cbeedc4616a2d79d8a2ca5d240989129d840f8242d23ac813bec4
font_01_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10812 bytes
SHA-256: 2f551a15efecd8306f91ed539e4dbd59829c6e34fb67051621196dce065cc688

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