Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb6d285e21164b8…

MALICIOUS

PDF

94.8 KB Created: 2021-08-10 05:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e9e35eea36c5d06ff1bd37a4d8f1f72 SHA-1: beda17a7664fac8c9b9bd2572ae10fe92e0b199c SHA-256: 9fb6d285e21164b8b39f8f19f678c591262f3a5602ec14ab17456a24c292c0ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to lure users into clicking these links, potentially for SEO spam or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609644a3de9c4---xaxutaviwexikawukomivojim.pdf In PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04a9511003---75642827459.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee52e57a1---18060545065.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0c5bc6e43---90730446692.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a29815793e5e851495228763fbca3215/pekubagusasidezubevive.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pesr7i1qpm3ms8fu3gu4kdb3fr/7754765800.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/zewewaxapenowefimuvab.pdfIn PDF document text
    • http://agrion.org/upload/fichier/jawotaxatedov.pdfIn PDF document text
    • http://hncastlecable.com/d/files/lukimubarebezusuvirowo.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/tosativewosuwuzokafururu.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/15feeafcecd00f5ed0aef7e29fefa5a5/24354477741.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/dewufaje.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/7063514025.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1d08f329---33669576946.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/re4u1t69b8alqp8oit6tj98505/betadovezamuzelupiw.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca314156b6---45952191879.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/jotivatavedakosafedinebu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b076f56d614de2e839c6d0fa3f165267/xosopapukuwodofi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/lubivemofumigidoweniw.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/sekiwose.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a88398fac---50352769050.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/55033386019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=exercices+famille+de+mots+cm2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 18904 bytes
SHA-256: b7b8c4d99d09e2872bae4ce0e65dc04a9672ff077e7aff5b61511052b6da3c46
font_02_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 16144 bytes
SHA-256: 7384f78f7eee0a7747af6aa54f6a012ae917b773c3daf511a94379393b43df11
font_03_sfnt_off00015180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15180 10736 bytes
SHA-256: fa0bbd269f1e9fad2d4f892364f55b6b8f04ac99eadf9d5ce7350ffcf9e99d99

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