Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eedd36e2182789e…

MALICIOUS

PDF

85.7 KB Created: 2021-07-19 08:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b31a6c11f56d4e7d3bef747410c7112 SHA-1: 379ad676e39e6f73aff47780e06c498d8780105e SHA-256: 4eedd36e2182789e8105e3f2887778ee4ad3e47f8e5f5d9b26b173ee59b0f874
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

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 https://rdsdealers.com/ckfinder/userfiles/files/81015539854.pdf In PDF document text
    • http://asustainable.com/global/file/76428121574.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/nilavapasavon.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f7a381de95bbf01d6d68a82b6545d947/92428057328.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/wemegibutaduserukilimix.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/ninumeviweg.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/caae3dd2b95ee43d0754818c5300a9ba/xanotajovojakuta.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/40606290a380bc89cff5631516436868/zudimuwulefo.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/20650929912.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/11803530785.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/juxaferojasedababelanuteg.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bizugarofekomi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/87ad1b2ce94271d8e59ece884e2d5d9a/wenivirigewejegebosi.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/kebuwejujevamij.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zobare.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076206c79d1e---11324737241.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841cc405c13---pabunenixageruwalegiwaguz.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73f0cddf2---melolojunepit.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/mizadipole.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af6071110e7---43411120694.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4d075a72932758238b9432dd80499a1a/vekuti.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b08aef194---sikelilozuremokagalu.pdfIn PDF document text
    • http://samtekelektrik.com/files/68390282265.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/regejunudawupo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160814650a5ebb---maxutovasawifi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078692e9b43d---naranigemuwufemewod.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608db91decca5---48077186665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+a+concluding+sentencePDF 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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 16740 bytes
SHA-256: d4018595afbbc155a72634674f9e53114e76f495b8bb93d4e2e499aa02cc8559
font_01_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 10644 bytes
SHA-256: ea7cd7a57a895dde7f23f1ce96dfd77207f874cd38404c56720dd0c8bebe21d2