Malicious PDF — malware analysis report

Static analysis result for SHA-256 4234a9da9c64e91f…

MALICIOUS

PDF

74.8 KB Created: 2021-06-24 18:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5fafd56d58eb9d9b5aeb8c421f3b6c43 SHA-1: 8e5a0bf65b4ae713f5fde5a16e193a1abfa40f21 SHA-256: 4234a9da9c64e91f657fa4471888259bbc8a9e26efc2b31be379275d3d2cff9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=color+atlas+anatomy+pdf PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088de8276d8d---tixuwar.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jeserapo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/13285d5aa4cc88a49ea8fdf89d1b51ba/vedije.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c104da64f77be5b20e5a5ca51e372351/lelisipewaribaduvafego.pdfIn PDF document text
    • https://andhimazhai.com/images/files/tenopuwafege.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/ruzix.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/oe36o3003djdebc24n3jhqj2oh/18002153572.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/zomozesa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bdc3a305aca0cf56fe5596bc57d2868/funeri.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7dd3666377415611c26aea51a4af9be0/6285385727.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210618_174739.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01fde9981---regixeposasusuzelopu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef0d42b0b---fajepewogusupetuku.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/nutavapobakafat.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/16382183719.pdfIn PDF document text
    • http://imaginove.eu/data/Files/61552007438.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 5196 bytes
SHA-256: f25e0107df8ea4f3d07a8f2ad46febd227b2e4e6d5bd63f81e01069888b3bd2f
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 11508 bytes
SHA-256: da431ca64534513e28c09eb60748ef0ac099b4cd995440bba4a61c877449f4a6

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