Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6d660328c62bd4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 14:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfba6fc28eb920714e25599b0c2e3fb5 SHA-1: a36b6d8ccf3a10c862e3f275df6a3e8b8d4d9de6 SHA-256: de6d660328c62bd4d42d3715e527a6d70e53b5b8e899b2b3ceb64da2a4648a95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary purpose appears to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=k+means+clustering+choosing+k PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4e5e1190f---97136379113.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355e5a3d20a---93258114028.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/luzutapa.pdfIn PDF document text
    • http://carbonelite.ru/file/nezasuvu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/90653894371.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/xizodonomafonaleju.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/78017918545.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/61461186504.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/57670249464.pdfIn PDF document text
    • http://quetthe.com/upload/files/18286586534.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18ab04f6a---jememebepo.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210904024608.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/98064713290.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/14756341842.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/wanuriwadunibiwajasowul.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/vimenesisotatamas.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/19617709859.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/8597675351.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/madolugerabejiditudimi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e150ee880---wedewaru.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/wajakapokuniludigon.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/kiwaxilif.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/23105737587.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/121786484161508bb3b3997.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_off0000b3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DD 16820 bytes
SHA-256: ff8a2fd74be28e596e6d6c365f7005aa0308ab99da0f592d5d5b2ce9d2ffe9b9
font_01_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 10860 bytes
SHA-256: 4f60ddd45116454583ecdc3be0dba745d56dafddf1e288e33c5788bc1d65f0e2
font_02_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1