Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c534ed595d0bf42…

MALICIOUS

PDF

77.6 KB Created: 2021-06-20 15:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2a81506b7eda307edf5bd0cb3f27881e SHA-1: e71b242e18c5c6f48fbafb8115d3e25934b892ea SHA-256: 7c534ed595d0bf42dc732e396e4d5e84b156e7a62e5230b538bd3bd21ec58046
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a malicious intent to exploit user trust by masquerading as a legitimate resource.

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/utnu6p3phnt35oik2kvrqdjcft/zagoraxonoduk.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/imfgc4e2s4kppdpmdifa86tohd/61287616848.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5e907d2af---zirivuwudilade.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051003412973499.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p5nm46pbsniq9mdb29lo51v6a0/kunabuti.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25f63214e---63370102050.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/49be036844689391edbe65892d5880a6/44210043094.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26706207c4---pepirorodo.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b999aa21001---pawurafumasibazonizajage.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/648b810616451008af4a30653d437f1f/mifipufilesonaka.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8ef64ed7---gisilola.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/8pdf8vrpoubslr5a7ejjvu0dq9/29911783779.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b878482f2c---xidijujebevo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file/%5C/2432468473.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bca69f5be64---32780851929.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/xezilizezaxako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=financial+accounting+r+narayanaswamy+pdfPDF 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://scripts.sil.org/OFLIn 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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 5624 bytes
SHA-256: 35dd8be24f1911475e53c87c594539efe3f037b0f90937a5644dc1b5bbf0c506
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 11160 bytes
SHA-256: ce821638407cdc90b7cad1b808fc076c0d96ebc4742edfd25ba5af5b4f981d9c
font_02_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16084 bytes
SHA-256: 2e6e85b7b3773207d50f59764995227ee5d260f7bc80f59437f9981b9325e8b6

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