Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e17cf64952ee1c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 11:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1130b1a63df10c69ab76e00a7da525ec SHA-1: 7c8727ea04a09829bfc103237f3825a7a3c88600 SHA-256: f2e17cf64952ee1c0d5a8f02753e65072ad0f7b3d7103099e1718bdecf94161f
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many of which point to compromised WordPress sites or disposable hosting. These links likely serve to redirect users to download additional malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367237795c8---ruzovakisebow.pdf In PDF document text
    • https://floridainvestment.cz/files/file/torexexalaxuramuxim.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/zafibesidixokugafiw.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kamilibib.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/gofulijivolofalijupul.pdfIn PDF document text
    • https://vzglavniki.net/data/file/66626114896.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/batomuma.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/1771264434.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/66977792442.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/vuwufirisoxidefaf.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b281a9253---94080107259.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/69854833151.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/65515438028.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/53516324477.pdfIn PDF document text
    • https://x-software.cz/data/file/26861743165.pdfIn PDF document text
    • http://gewald.ru/content/Files/fotopowa.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/36490902540.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64997465555.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161471f94d3b5d---27581165420.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/xesobi.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/53671344751.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/29829928075.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161439ca847cf9---jalojurex.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/zinerofuz.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/69896318063.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/jawedoloderejegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=play+store+download+free+app+installPDF 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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 10692 bytes
SHA-256: b0d22ea6070097c426a0f6bb1578b8a1e49d0fec198cedb1772ed70a900d002b
font_01_sfnt_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 16784 bytes
SHA-256: 9d891337d857800d3bf7a814188f03afb208949a9e116b7c3846981b7a197e98
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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