Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7baadb4fd018063…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 11:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8eecacf8ce4687112c3bbf4b76753a45 SHA-1: 5fba1b3c91d25fcdf5bffd5914b22ca4b8ea7a91 SHA-256: c7baadb4fd018063dff276b6e43662507fedf6d02a3aa73cd0eddd3fd6c2e675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=gra+w+statki+android PDF link annotation
    • http://ji-tien.com/userfiles/file/45594496325.pdfIn PDF document text
    • http://cortabellanews.com/userimages/80242532912.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/97785526800.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/baxor.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/39826608420.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/39050632829.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/36755219249.pdfIn PDF document text
    • http://01host.ru/userfiles/files/97796680007.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/92583521354.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/76784213664.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/79815242413.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/81422545524.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369d18c959e---52648047430.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/kegomagowigifadigefuliv.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/mopotaxuvodugoduxova.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/75483684436.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/zavafurut.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/9818720496.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/rarowizuduradazed.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47e2a2663---kuminigekikuketavowovijeg.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/612f2a1f41b8d.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/karis.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q9p9uleossvl0arbn5o4miiu01/vosazefizapezevibu.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/64384990037.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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 10280 bytes
SHA-256: 54ef663c08c59c05076b4047500a23e614c44301b21a8b6f82215b96ea98c2d6
font_02_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 18288 bytes
SHA-256: f5f4eb32c6ab12aa92f92ed7a7e99c4e234ffbae459e8d242ae52ad6a3b9acf9

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