Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf03f07e19a82e31…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 13:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8983eb479b4ea5ef1d9f44e4138f6fa SHA-1: 2de7596c7cd7f9a63277aca16d59273d168252cc SHA-256: cf03f07e19a82e31a7d8c9a8c2a294e3eb325a6c4e958c457b534ae4cf0afe10
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=us+china+trade+war+pdf PDF link annotation
    • https://palcev.ru/userfiles/file/wizever.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0udc7jlodgk3fqpc68tg727134/3723510905.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wabozuves.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611329eb6132e---nufakimexizava.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/15259814944.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/68793420680.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f924d923d35---6654940485.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e93d07250a165d036472f214ed691151/80055666730.pdfIn PDF document text
    • https://poker-fire.de/file/85230785179.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e87e745c13eda0cfc1de9c4d57f9cb0a/3460496573.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/sadiwamebiditukifikew.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/qfe3i4afnuf4898vsbp16qs708/wepuwivuni.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jidujiwudebe.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/86eea986462fcdec013eea40135186b0/xozadapenoganon.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/9783723319.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/gapafefebali.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/480179694.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/xiwowifotuvefodogajobi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b206367d09b6b5b3911c4ac830d9828e/javowatefekokebavupunu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3919eefb92---42641231179.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/11863623594.pdfIn PDF document text
    • http://elitvorota.ru/f/file/85244785767.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874eba2494e---57747513320.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_off0000b75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 10644 bytes
SHA-256: f2cb0bff3136df70878b94f6a809997140182394ad31968d3203b02b3fad8575
font_01_sfnt_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 16720 bytes
SHA-256: 0baa3e6023a275d9f4d29c332d3add5234b337b2030c19672df64ed1190da3db
font_02_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1