Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7237f51ad1731e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 01:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43538c07b9d8e0c630cdae3b632af6a3 SHA-1: 338e5184fc5b791b7ea5a3291964811413729c88 SHA-256: 4e7237f51ad1731e5d47459ed80dddf711efd021cbdf602faf40a6cb779311c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/66af85d35760dfb1b23e446e2411f2cd/78570012685.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ai85a1vuv6ssqgo804cesijtkj/79652475516.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/43829651157.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da00ba4b514---38558941807.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/piwemawibovajojukor.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/43562859904.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/80017987306.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/80107976513.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/97067842847.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/25838964428.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896f24c741d---jabozomum.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f81b536f1bd---fevawene.pdfIn PDF document text
    • http://portableandcool.com/files/files/63863690626.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fodufusosomekirij.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7ac5ec8d11318da5274b2a80c612d266/81775054862.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/57818900303.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/82378092304.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901c16270f6---fubebokufopesifefedumizo.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac208e1774f---54644303823.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/gawawilisunidebepem.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wegoketekarukusid.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/77539573052.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/54009592042.pdfIn PDF document text
    • http://accronline.com/userfiles/file/wapivunabinobalegilefuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=counting+1+to+100+worksheetPDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10660 bytes
SHA-256: b41e51c7f5e5f90759bb2f2031d4e8f2bd63590144ce3523a0f60257e641a03a
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 17368 bytes
SHA-256: cfcbe73c75979c8a41e458ec12de05fa458a865f8942acc794e68c85a94b26b9
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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