Malicious PDF — malware analysis report

Static analysis result for SHA-256 111bb848ab8c6195…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 15:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46ffa3f3a6c99948681a088fb8d8239e SHA-1: fca7070f13d5b14edecf39c2ca5d511dba2ad038 SHA-256: 111bb848ab8c61953d0a77d258354d3006c837ce77df8c0362283aabcf80a6ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting the PDF is designed to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://sinosteelcode.com/filespath/files/20210906125143.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a8ad0225---biketatojetidubusenone.pdfIn PDF document text
    • http://haai.org/upload/file/buzanumopalij.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/13222105012.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/dazipivu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/38286022532.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/23319628029.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/rokosup.pdfIn PDF document text
    • https://pecsikult.hu/files/file/nozarozugoviluperukisoza.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc56ac1c6---55012796926.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lirizefaso.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/40622150609.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/13440010432.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/53442248627.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/korepezedodovifo.pdfIn PDF document text
    • https://somogyplusz.hu/files/letukaxebedajudikogobi.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/todaje.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b3686ca3---95958299999.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/tajefinemupavuwivofatiko.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/33571067938.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/76721704588.pdfIn PDF document text
    • http://manu-transport.com/documents/file/tisanijutabov.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/16847902508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+to+grayscale+indesignPDF 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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 18536 bytes
SHA-256: 8a99b2abcf0451626f68fca1faad3eee6911e85dcc0d40ff91069b73b4b1a7c5
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10756 bytes
SHA-256: 66fd80f86937c0eabcfe3f1f15801d0ecdc196d095bbadc9f5c75156bde49018
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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