Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1e926763cb2c4d…

MALICIOUS

PDF

95.9 KB Created: 2021-08-19 03:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09b44e79f1930e08738cde86298c138a SHA-1: cf4c16062a17da5a9cb8bfb96821e9bbb51f1ae9 SHA-256: 9f1e926763cb2c4d61218418ec0bbd0543bfa4df18b7c9c4c5700ff4c97ada89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://k-souz.com/userfiles/file/57319214757.pdf In PDF document text
    • https://ferado.vn/userfiles/file/83008010690.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/56086131125.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/74753154253.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/wolawefiku.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ad5hhugtaerh6kl8c5o1kbia44/91864333705.pdfIn PDF document text
    • http://air-ned.com/uploads/files/rojisarogakezozikeluf.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/67917469552.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b8966d181164cf6c8e6ecaa85f019477/68300811537.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/54117171054.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fowafumanominolupolinogo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8f24qrpp6k4jgueipfjan13uc5/figukisas.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/pukijidexuke.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092404a8b836---voxugejezogopipagopupaze.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/db1b85a837f7af2c708722cb73bd8743/32540171063.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/wikejekasosilisem.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/13919223004.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/nobiwixebeme.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/edv3hqpu8t66gcu7nvf4d4bb92/pinikuma.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/43978352639.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ef516a20bcca6cb40baeb7813a873532/5682803267.pdfIn PDF document text
    • https://sanidom.pl/img/file/ledepiwezexusitojidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sample+essay+for+financial+need+scholarshipPDF 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_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 17480 bytes
SHA-256: 43e8ae67b30b699697eee2167fbb14833ee1c146f57f899ce0adbd946c2fbb8d
font_02_sfnt_off000158de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DE 10976 bytes
SHA-256: 6a8e0a3c60fcc31db63ed0f93f56c6d20359fa18f18fcd28f3e6c1f53c22bf92

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