Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6f595d1a84da40…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 21:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37ccc3eaf1c5c8b6e43402040e2312e9 SHA-1: 96e4b1c31d5088cedb968599c22487fcffe286d9 SHA-256: cc6f595d1a84da404fac7767ca107b75ed1462a9be3717857d99dada8137d98c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sportnazona.bg/f/uploads/files/85633879223.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835f4290948---77356887466.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/sipudawefote.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/zevasajumisipanofat.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/55004873704.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e5d944b24f---68624747399.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/766ac9gvasg7hfvb6kor6krir6/45693667794.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/gikajizas.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/69040740145.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d85356e9bbb---jadalofidiwumekekalil.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/26189367733.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608671c6b3d2c---17921711502.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/bixilekuzepis.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/21f26619fa654f34207f1c2576d2ba86/53305118292.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/botonevago.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d5d0cf22---ginasewuboxikukewovosij.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/wumijokojagup.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed5ba37a88---povavefulowuzerado.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc19156b---63221177384.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/24316910408.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/dojimabakezesaligebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=louisiana+earned+income+credit+worksheet+page+18PDF link annotation
    • 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 18092 bytes
SHA-256: 9d91f61a3f2a9256072d72d3cbcb265626965f989b30ec70209c8df32a6b02e9
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 11412 bytes
SHA-256: 5176d9b43e7f683cc38c81fc8b09d7f9dac128a5668d32800595fcbdf129db50
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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