Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62e66f94d5df903…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 11:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a09096d04b10080f1a26e6d0856d4ae SHA-1: 608b5ca54facccbb287d749ed657493e8f9e751c SHA-256: f62e66f94d5df90328f9141f6e020dffa417b4f6863b45b319d40c219e79aadb
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=ak+jain+physiology+vol+2+pdf PDF link annotation
    • https://prestinireedcorp.com/userfiles/files/lavuda.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609613b77d4d3---57031532300.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/03cce2b868b5076f16c3f5712980b739/272740321.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/egi8afrsib2b6c1qekk5avvahi/87580867944.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/vafutibukisisulo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59f2a8bd3---33823165025.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xetosumegesizufo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/53806595241.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dd30868fe8877dfa5669fd346db59b61/3468905878.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/savopuwam.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/kozupesa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c162085d8a005c52dea0595e9e6e1e73/getiradak.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/85728263651.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb2c157d2---xoziwefojukexuz.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/28909844215.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/sesijofa.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/sedexowofexomimasulirebul.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/9295526734.pdfIn PDF document text
    • https://europartner2.pl/uploads/likamonozepamivebaresupe.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/71274899952.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26592386966.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/elhbk7h8a9m3pfd3bagcde1gmj/89537437321.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c155b2c77ec---61865119688.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/bonikimozi.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_off0000b966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB966 10948 bytes
SHA-256: da68d6914d52ce6062a3779fb31f4cf7ec6addac73f1d65a490c1172aaf33d5b
font_01_sfnt_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 15756 bytes
SHA-256: baccf9a35c83cd3be8e17e9d853b20194480935050fc61a6e2ae80c440304918
font_02_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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