Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec86cd3b82b185b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 20:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83c980ac00bb8663468f2f02e3cf8bf8 SHA-1: 22a9a402cbeffe147327db850230835a8732ed1f SHA-256: 9ec86cd3b82b185b2325f51e47fbeaf6c9d0f179a669e4b2ad123effcf80c23f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and link farm behavior are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://krisoc.ru/uplcv?utm_term=plant+organogenesis+pdf PDF link annotation
    • http://toyotacri.com/userfiles/files/17011976086.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/jebatoxapovosuvibigix.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/27081029242.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6d033fdbdf8b0ffd14a5d9dec6034aa1/kigawebefajironejaw.pdfIn PDF document text
    • http://scpt.it/userfiles/files/sapitikadumetazerive.pdfIn PDF document text
    • http://mimpiindah1.com/contents//files/10083866230.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d67cdb3f6e33c05e02aea1caf8d22376/66549895153.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/22705168647.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/godadakupogapagaxemibe.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0bfc5c2e200a12031548d3082a99cef8/sufutepasemerefugew.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a13fbec94---72000378374.pdfIn PDF document text
    • https://ideaoneinteriors.com/images/bulk_images/files/92614501575.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ae1b0c041---409219603.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd7a0d8e5---janesusexirejakasugadoba.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/p1g81q4olnpgq2u5fok5n57l15/39581139876.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8a8ceba0f3d33a935dd77cf960070785/vumojiwuloxexex.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5a2a4475d708c74e19efe60e92189c8a/bamisuzezakupujadogidijo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0b20ee7ecbe13afc070751c3ca5b09c1/77589253514.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/xetikijemizovazu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/75d518744e33a84a1310454035d53de6/fukejenoxoruwunom.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/rumedare.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/724b68ed8ef4a2114a98ed984bf71ad5/zonuxe.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/edcdd3badf1c89a8cc85539d7f6fc958/vukabiremizadomirat.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/36850212211.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48294828021.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jq7mn69ddgedpjrrrap40svvul/51487208454.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_off0000bb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB73 10676 bytes
SHA-256: 1ed4f53dc86a74f00262b72354e54609b6b8ede76e240731ee7b08aa99ef09c8
font_01_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 15724 bytes
SHA-256: 24ad7bf1bdd7f8f1c709eb172ef34ccaa929605b83e41ab398fb7bffab678306