Malicious PDF — malware analysis report

Static analysis result for SHA-256 9703c03e0ba7426b…

MALICIOUS

PDF

72.4 KB Created: 2021-06-27 23:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8e509a702eb1677b16fb6fd274105f4a SHA-1: 4acd96d37c082428cc8b699a9b1265850d3eafea SHA-256: 9703c03e0ba7426b33587c292aa55eb266ba19e964ad2b16f6cf17a820673308
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to disguise malicious redirects. The primary purpose appears to be directing users to potentially harmful content through these obfuscated links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607458b64e505---43566447744.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a861fbe8c54---57043647541.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27173404360.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/81918219169.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/resasolilinurizasipime.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079817321---73604111152.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/migoxekutorigabasopazuzo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wifagudodagenek.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b4531d7d---zoradogokusiju.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58944755359.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfvt6q4pn7qo4vj99md11boj00/borimolatedofawudupoto.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/refezodiwitakemefuwaka.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9a4ed4512daffcc961e2c3738a347ae8/55509954589.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0aa8f51fa86f48bf0972a9d6b62ad424/92284817445.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b21f20a47519607d13d0fd6864f2608f/45941799872.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/htju8lo4bvl8cfd87lqgdd0s4o/24973624592.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/037ed4aaf32396a6d2523a417f97bd56/zozudonigukirelusateduji.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/45f2616r4d16u1dm99tru4air1/wobajobimekurepag.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e63aa12d6---duketoje.pdfIn PDF document text
    • http://quaint-house.com/49155169717.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5716688352.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed566a04b---zabugomomoraboxu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16074c83b6d424---pibekuv.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e65ffcc7c80b6b6b5c7cecbba0cd7b7e/wabefazupulisoxubuxis.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gesidaba.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/73964272752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=citrus+phytophthora+gummosis+treatmentPDF link annotation
    • 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_off0000bb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB77 15376 bytes
SHA-256: 3018aeaa34b6b66526f786009701467d7b40c5273ae5aa2ed10671a4ca8260c0
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10896 bytes
SHA-256: 3c6fb4ab333c5e9704f5dd64d08f2506c8ad86c3e0203e99d41332df97442675