Malicious PDF — malware analysis report

Static analysis result for SHA-256 450b2a219bb4595d…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 02:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d32599d17ef198b65087c29387ac0eb SHA-1: d76b185742f587a615e1dd4d192da89318c91844 SHA-256: 450b2a219bb4595de13f511cf7d09b62378f24f09a8d5555ab70939d0c9eee3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.allatpatikapecs.hu/images/file/tuvipunetod.pdf In PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/96346286b016e16daa0fb2102252f0a1/61664491709.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/16300898827.pdfIn PDF document text
    • http://brukbet.com/user_images/file/tezopoviku.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f418ec6b---97291458731.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fa5b41dbae7a4de12cdea5b36d74500b/ximupekutumaji.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec1634f5---67721250775.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5ab6a8efa---218707866.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a301245886b---verida.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99218a1b8---87778420882.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecee6658d5---wewevafubuvile.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/5vnnll7ve6o27c5pje853elpk3/pususifuxufalatizup.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080854d453bb---juborofoxizofokuvowesiv.pdfIn PDF document text
    • http://email-database.info/userfiles/file/66326181846.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ea66e4c7c60b9c84c8007631ec79d0e0/78069897582.pdfIn PDF document text
    • https://artigianoteca.it/file/33848845920.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160874c7cb17ea---xabomigin.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe51947e44---34431561196.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wokotobotip.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/57562830158.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/870e40dc20e283b4c57298d842e61b97/roteto.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48de71777---32517875746.pdfIn PDF document text
    • https://ismart99.net/upload/files/74906150578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=challenges+of+management+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://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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 10784 bytes
SHA-256: c755d791412c5111cf3a714dee74b0606fd246d3b02b03e72e5d9077c9e82f79
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 16080 bytes
SHA-256: 8c3a2f8eddb08158780e28b43e038c06d02ead0f62018662f1ae81fc7471ce42

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