Malicious PDF — malware analysis report

Static analysis result for SHA-256 e425766317edd037…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 02:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 917e6ab2a927d8b692d74a886c14b8a8 SHA-1: 307d6d35d46bb4d9c397f8ec60313ae36198892f SHA-256: e425766317edd037fe278a4e8a271f3c662c3a10a0c6cac4c9f85f4797e1fe03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting malicious content on potentially compromised or low-reputation sites. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection ('Pdf.Phishing.Trojan') strongly suggest a phishing or malware distribution intent.

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://hasici-pristroje-eshop.cz/files/file/vodumododex.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607872cab6f63---85234233218.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/50142748300.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/vupevasenoked.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kifubikugofebo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a7513de7a7bc5c3fa2b5882a23d3d0b5/95999474071.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8mham35ialrp63fai9t32oef57/34977784912.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/nazukafasimovutajemix.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/69038967318.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/36907915341.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad94564fd4---rojirekar.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/70782063233.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090fcc6be14b---zoriwadimev.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fe4d8f65f---xomipababemaxitomijosiwom.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a344d57be78---84783175410.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/83624716800.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/siwudolokenakoz.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/mowomumisorozakofopomit.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/89192386405.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8c2a8c7ee---70055913752.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/81cm3da1nlc1epsngok4c88etj/puxaxumuxosilisisise.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/8066869940.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/33605713043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=planets+worksheet+docPDF 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_off0000b83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 16044 bytes
SHA-256: f5d65a4dec862f9e0248ea5d4b3c2d00a7213e3df584fd3df6e18c2c8b58746c
font_02_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10556 bytes
SHA-256: e0f82bb4260df7bf8fdf3a79ef78f8c454a767f99a93c42c4172ce6810c53fd2

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