Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3796457b71ff304…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 05:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 32278825c1e14e293b126d386383f2a9 SHA-1: de69779f3989d1dceff11b5995f598f59e3e9a61 SHA-256: f3796457b71ff304edb4fd490b7daea0bb6047f0a98550f3a401e8e30d1d2d00
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the phishing lure. No scripts were extracted, but the overall structure and heuristics indicate an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://eyetracking.pl/userfiles/file/46395943480.pdf In PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/97354940742.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4acf5314d.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/96892568332.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/dulubekobepowigolam.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210805_859C1A1BBCDF528C.pdfIn PDF document text
    • https://bataretak.com/img/files/file/6148411655.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/60923608127.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/92540544747.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/12895857902.pdfIn PDF document text
    • http://m2m2design.com/userfiles/5086380218.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/28897376711.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a817fed827---pixafugedo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951c6c915c8---16573019064.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f34c6463622---lemazumutobixatepovim.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/ritinuzuwebodotenexoxo.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/tuwusokoreveta.pdfIn PDF document text
    • http://mega.kz/media/upload/files/gelijejipafo.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/xusudetixuxijutemabusawo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9963671f---95678745795.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/53439503613.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/68bb9e2b5e7dafd8f180e0ea6dd85716/13649089933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=google+drive+print+to+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_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 10448 bytes
SHA-256: 7b992b8d565c3bd225a85210e7529b641e4c778f9b2596b23204b89906287985
font_02_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 16936 bytes
SHA-256: b9898a36fa248f13b42d5981bdcd86216ef9efae370b6595c8fec8de2f8bb5e9

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