Malicious PDF — malware analysis report

Static analysis result for SHA-256 1915510abc21d104…

MALICIOUS

PDF

163.3 KB Created: 2021-12-07 16:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-22
MD5: 36a4cb6aad040552eadcdebb6daaa731 SHA-1: 1951740cd2c27878576db12c54fcb16b692e1ab6 SHA-256: 1915510abc21d104b14501f968d899bd86f8d1de95070fe9ab35583a8b014b19
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://uat2.hkha.com.hk/ckfinder/userfiles/files/1167577043.pdf In PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/43145969359.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1619bd212b4925---kijolipelorasadijutefe.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/mugujegibovi.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/11963584418.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/96926993986.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/gewupegetal.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/segonesolinib.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/joxagovasimakukegusevifib.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/rinife.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/8502536338.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/gajoviwodeni.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xotobamitajovexosugagaz.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dc1ed5f451e7f1a94f8c3616d3082a87/ledinisogenosa.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/jarolovixoletofi.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/dubufodi.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/xukofiwisaluzo.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/senor.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jujamanolexuvefemowidobul.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/wixakegebudimo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1617fba41ed182---10760368023.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/23043931505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=yt+video+er+mp4PDF 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_off00021aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AEC 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_01_sfnt_off00023190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23190 10200 bytes
SHA-256: 4f55e91b941db61ee0ca1dd8622611fd4fbd4acc5d1b2ac870d7a3afc4641690
font_02_sfnt_off00024863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24863 20044 bytes
SHA-256: bfc54d19d1bf2beeee00e47fc6f63ab5fbaf20fed48f044f7c76bb22bda75845