Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c74936fa8a2bb7…

MALICIOUS

PDF

98.3 KB Created: 2021-08-16 20:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3a253c26065e0f9c530ccd87ed517df SHA-1: 6c33bd250d0e0851e4f0810d3838c9afb0ebf39c SHA-256: 17c74936fa8a2bb72159132c35668a766771d2ade7820d0bfabe5a99dda1e05e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://seamacros.com/upload/file/divinesopizujekozug.pdf In PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/60543246017.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/bawopega.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/67d49ac590173d40b40ce20e707de57c/terexesidabusovufuzag.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/xukisodo.pdfIn PDF document text
    • https://rinducm1.com/contents//files/10187434930.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/539bb02998f75d906c83a1b85dc5e6c3/lasujurojuluta.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac63be441---34578601412.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb59575d4---pivifit.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/8143306257.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ef0f0661292f4234e7874e385bfa77d8/6433378606.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a248a2053a---77534899104.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/34152843597.pdfIn PDF document text
    • http://orderkai.com/uploads/files/54931340992.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/medalexipajovubifogu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d5cbf1d2---gapepofigawejewanatopul.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1705065ef---benisorekagum.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d09e3db8---16954988267.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16114782829561---xapezagosejem.pdfIn PDF document text
    • http://yanartextil.com/firma/files/difusebukafolirikonobomev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8d274051---mewaganazajedomazug.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/givexeze.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/taduvawoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=juegos+de+lucha+para+2+jugadores+pcPDF 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_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 10840 bytes
SHA-256: 363a97c41c24ffdbf48138edd9384ba738f7780645725b42b7efa81c566e4507
font_01_sfnt_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C26 18104 bytes
SHA-256: fbb872f77f440189b1c57378f78c6b65883d55316e52c4e1445110c26c7257a6

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