Malicious PDF — malware analysis report

Static analysis result for SHA-256 1181fd9eec42c321…

MALICIOUS

PDF

78.6 KB Created: 2021-08-01 22:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39d307a4332f9389542f2ce229c7edce SHA-1: 6106016162266775633ecaee02762be30fc5f0fc SHA-256: 1181fd9eec42c32168f115eea25264e78689f5e8eed1c82538f3cd5e281150b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the ClamAV detection indicate a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=descargar+pelicula+de+steven+universe+en+espa%C3%B1ol+completa PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843146ea27d---30082836108.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c360a5ea168---79869029774.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/beziwot.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/n8i25gn1orsnic1iblg537nvsb/65709142535.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c19d4e025e1e9ead32c9ac78eb7fe77d/57121418651.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6d804aab6d2200301ac3f8493c775fe3/37111742565.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb6acc1d9---29214741349.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/11553176847.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608336287e633---14782323180.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aae77ea810384eaa42ab3a07148af409/28057527338.pdfIn PDF document text
    • http://devison-matras.com/upload/file/kevefogaxaxem.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edb6bf58325---wolulefu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3fb4e76f5---38831329826.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/26452872718.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/tikewevinexoluzupejel.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/92230237551.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/549ad99ccd488578e64a2a713a42e5fd/gibatupigavozaja.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/lijigixiwo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ec6bad078b---majiwunonexavupolelutof.pdfIn PDF document text
    • http://turatabor.hu/media/3511158393.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/tngp3ijgb9n7otbdr3r5svgdmp/75118448282.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/91394297595.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e397a9cfa---varobano.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/37999403849.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27d6fbb02c---toxubezikowuponuvanatepu.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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 17760 bytes
SHA-256: bfa13ed44ef923fbb8d65e91e6ee94f1a3c822016a72283f23fd943c6536ec75
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 11232 bytes
SHA-256: aeed71bc3157ed84271766d5d12f5d81c15819c2ca747e4c2b4b9841e1678cd3
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1