Malicious PDF — malware analysis report

Static analysis result for SHA-256 503a56a98f5b8a62…

MALICIOUS

PDF

100.2 KB Created: 2021-07-31 08:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5f8e083dae132d34e1bdedb513459f6d SHA-1: dca818e395d5bb2eb349599dd58dd30aea486a08 SHA-256: 503a56a98f5b8a621d91fa1ad07f0f414a4ff197dc5d51a3ac38c2f7a0c45ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=tcl+led+tv+service+manual PDF link annotation
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rurazudezorufezubulotabef.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f88d2fad---mimugasamamukasoz.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3952e816b---13900208972.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/64253721878.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210717053018.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6738e9f91---93591366265.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/gujiwovosatuvud.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/38ade011af1ff292427f86ac925b1b8c/judaruxamesofadudi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/748626857.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/pobagisizibadewixik.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/71313943945.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/22370688200.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/81078044436.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/59322331694.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/45758290160.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cd121cdb1fe8f2249082f9c46e56bdfe/4519515260.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/komirarudapomatasareni.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/35jfa8uk5ijudktq4el1sa6r5g/45324783246.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/24934845359.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/nojilenunuzix.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994900108ca---52772356145.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/45eab58299edb41eccbf5d78bf83b557/palelugawujuxopunop.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5acab1ee4a---11794350719.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/81388712674.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 16232 bytes
SHA-256: f5d193b1cd74aed89da2b07d0d741107379c8cb19bcd48ac48359c42455d9745
font_01_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 19300 bytes
SHA-256: 501dd485c727ecf7d864a1be9cb9215995dfa7765dd4912d5241bbcead72459d
font_03_sfnt_off000169eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169EB 10540 bytes
SHA-256: 5d468322679e1a15c56ea66f177b8245594f2f0ff78a8988985d400072b26897

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