Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f67ed2e1fc01d2…

MALICIOUS

PDF

71.7 KB Created: 2021-08-28 04:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc8090002d3e6e4837c65358c0fa7c1a SHA-1: 6586c93298432f3ac1b1af09fe087ca96aff3094 SHA-256: b4f67ed2e1fc01d2a8813b3b7af77bc0a60abb2b074efe06a68f980b640aa8eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/uplcv?utm_term=principles+of+success+in+the+bible PDF link annotation
    • https://digireg.se/upload/vajutigorofu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d0f3554a1568263119fd9f9caf9b7dba/rumokisativegor.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4bbb141b---27845240061.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/87244098571.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/jopepabesawuwutitotudidi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161142ee51749f---35795096862.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/labajejokajenudutot.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ctdi0234np90fcsosdrb9cu85s/62864655976.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a4478060---zederejamiz.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d98763bc42c---vuxikagajojazapagas.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/83609537102.pdfIn PDF document text
    • http://waterreducer.cn/d/files/mopifore.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7n9ejsej8nlklm7l23skqqie4o/wowasusefurivosol.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6ed4b4fpr3ugpap8b97rbnulb6/nevatigor.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7045aae44---mejiv.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/67348162886.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123548f95a7b---samupen.pdfIn PDF document text
    • http://yulintimber.cn/d/files/35250735739.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/pisifu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f703bcbc0---nozujanapixokutefakozo.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/39100b4de9df4b757b9697ddf29df593/petazinepusur.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wunosaxumotaxeruriwopuxe.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/pugizapokereju.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_off0000bb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 10656 bytes
SHA-256: 03af2cfb18db0675e2bc035594e2f885c54706583c82656f4e543ee465fa9d08
font_02_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 14716 bytes
SHA-256: acd60a4c41ff2b81742e9fd442e930fba3055225c03bd3738c87e33a0b7f1bfb

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