Malicious PDF — malware analysis report

Static analysis result for SHA-256 592f30b69fcb3576…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 14:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dddd93da446e97c67e27df6cea7a8bf7 SHA-1: dbe4928d37a583450d1dd583587edc81c3b2d4b4 SHA-256: 592f30b69fcb35769e58bb73279212f38bf367d625c2445bd4c805da59dc211e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://podimercrm.com/img/files/jubogedurubises.pdf In PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210906224600.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/46457037175.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/76735624822.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/87a2c92d56e9b2433f77f7bbe93d1c5c/gosokagivowadamizupexiko.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/femipegixiwujizosolenop.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76900658925.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pewofetexurixime.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c5caec2cde7e69c56fe2fcf7f9fb5938/jemamogumofu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ekhpfa3u6955lk75puaommoq6d/girofigefabulaxitanot.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/14789633045.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/68448636040.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadb86587a---7584679587.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/76781025507.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/lutezatawa.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161327ee405d10---18836925470.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090305463073499.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/43404273874.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/42542658211.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/39328502336.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jidopujuzurijop.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/kezilaku.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/35329319463.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/1286041735.pdfIn PDF document text
    • http://360global.ca/userfiles/file/62149298330.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/25948633934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+confession+of+fitzwilliam+darcy+pdfPDF 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_off0000be72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 11108 bytes
SHA-256: 8badf82a427e8b8042ff1e9e1ec6a9192349a3c8b5e12b4750f952e85b710580
font_01_sfnt_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 17388 bytes
SHA-256: 12a5a905e81f5a99db43adbe959e8372537e0625257e2b5c6bbf8a035c350738
font_02_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1