Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcc99c15166a8dd…

MALICIOUS

PDF

78.1 KB Created: 2021-06-14 17:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce9e82e5d4bcf09dc28f9b3bc2457f1 SHA-1: 81d88e50878b7894a5e2388bdec8e009fbcec3b6 SHA-256: 7fcc99c15166a8dd8e8673de7ada074b7f78e60a5491632008773710e7ddb61e
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of a QR code lure further supports this, as it likely directs users to malicious sites via their mobile devices.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=beyblade+burst+pegasus+qr+code
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5c52e5fe---68885817565.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad78f6074c6---tifipiduwopojobigekakafad.pdf
    • https://prestinireedcorp.com/userfiles/files/22560149405.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d729babab---zenitijibavexuzajulaz.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a142474cc92---totukapu.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cffc89eacfb7d18b4b5bc74ef02174db/74430140227.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/39779135bfc48218c39e48ea8ead06d0/43677300865.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e2caa596---gokidikigobuli.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/520d93fc9c42330ef2401c5a559ae9d4/panoriturupakisupezej.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1726be515d---bedatorese.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4633057fd3---toniwuvimula.pdf
    • http://aeronautike.com/userfiles/file/mobajamaxufosiroraj.pdf
    • http://bioident.pl/photos_fck/file/lujiwezuxozi.pdf
    • http://adamlegal.com/userfiles/file/17638939404.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fa1o1a55u6jlmaagl708p9ppev/kagorekusopegoxerowa.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed1be99d74---21156810857.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f281.bin
361869666cf5724b9fe4b5d813bdf1802720146054cd2f0ce93b01505c63422f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 5656 bytes
font_01_sfnt_off000105c8.bin
d2bd2977a8a0d7306e982606f387b8686ebbbe4602f41f9e47990883eb17efc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 11540 bytes

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