Malicious PDF — malware analysis report

Static analysis result for SHA-256 771524767ff5ff66…

MALICIOUS

PDF

80.1 KB Created: 2021-06-20 02:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 26199db9b0bd0352799244d4d3f5ce9e SHA-1: 0420f000244930b1e88850da63ff61a8f8832e7a SHA-256: 771524767ff5ff66d58256b4a1787c8742cf4084e701f8b5e08d448871906781
176 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting services, likely to distribute further malware or conduct phishing. The document's content is obfuscated, but the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=deductive+and+inductive+reasoning+psychology PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ecf973c2db5c9669327219a83a5dd568/74792125660.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e5fcac450a6e134b8ba65b2ebb865abe/pelinalanozav.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2bc9d67b---20588604326.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kvu6gqlaj45568ktr8vrqphd65/53709293526.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/paxumisow.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4863a95e2ad8e8e6f780861ae1273726/jawipedukuvafuliri.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaef855c8---mekewuxed.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/86925321863.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607210dd1f12e---nazeso.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/99847030171.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f63b372a9---riwitokoveguzix.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/35df19e78c19e2fe316387c511786594/beranuwuxamuzena.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4796e776c---43065103977.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b617812b68---74971182039.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/21088187612.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/98f035a4ea0fd017cdf9d2450429f942/medatejelolupeg.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/i91k73rs4ednm2r9e35p3u5pa8/37896519453.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc940b439e---99392803252.pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 5496 bytes
SHA-256: 3fbb4e2f77ad67a0506838630567f4c18fcfc3031a5cd3d6a10e892adf4c7057
font_01_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 12016 bytes
SHA-256: dbe039b8b1cd58e7a7afce59ee8a63f067a682392ebcdd15ef12443d260cf903

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