Malicious PDF — malware analysis report

Static analysis result for SHA-256 45de5e9f768914fe…

MALICIOUS

PDF

84.5 KB Created: 2021-07-13 00:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 238fbd3fd5a479a99c0f0f1c3d652f24 SHA-1: 66e0fcc10f01c3622c4b7fe8d2fb319e9f42adbd SHA-256: 45de5e9f768914fea0e0f5479a7e3f045b5d8ea11c371001480f7724e1f25cbf
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress upload directories or disposable domains. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to click on these links, which likely lead to phishing sites or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d49d19dcaa2---41504018383.pdf In PDF document text
    • http://capesociety.ca/uploads/files/34497362902.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/zudab.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/kozobew.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb47eaf9c0---fudasulezomakosezejaj.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/21584157487.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608139f64f8a9---62557259461.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbf0b1864---99567220460.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d5e96a44b---47950660004.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/xatavajula.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/48e32542743315614ab4f871f9d49aa5/vibeledu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/70459050773.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/fosofixikobud.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uivba3t3e99f8m125cin0il8i3/46538382138.pdfIn PDF document text
    • http://amandamaitland.com/images/file/41534718865.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071873dc9358---jujez.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/ketegovi.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/jenipezub.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/19c51b27038aedc651d9e368f850d803/28897394770.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160776350465cd---29930926896.pdfIn PDF document text
    • http://demkapi.com/resimler/files/wadejexu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d060e771b50---72400895425.pdfIn PDF document text
    • http://juha.be/_files/file/81093969414.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b331ef5699b104672625baced0ee107e/11541033205.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b92ed8360f---pufefusunije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=right+to+meaningPDF 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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10288 bytes
SHA-256: 9c7843decaa2204f0b0cf03df9b91ec919922f269d5afa044f50a3714cd70b57
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 16200 bytes
SHA-256: 3170b35c686b9db09049619321fbf24d6ffc6b7b79b9bcd72778a89dc732e916

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