Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ee25e3409f611e…

MALICIOUS

PDF

91.9 KB Created: 2021-08-22 03:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 49b0da4e6d0e5776e118cf6ada7bcf20 SHA-1: 1d4537fbada3bd3202d5d5c2523c37c3d8e95f7d SHA-256: f6ee25e3409f611e43e41041f2b742f4314d05fa6198c4de89135ada50c63696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malicious content or redirecting users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vom-ragnaroek.de/uploads/file/9234818937.pdf In PDF document text
    • http://ck-tct.ru/userfiles/file/28081538815.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/wodidosaxuvimegarunakume.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/39b9cbd6056f47ca4dd7069c9c4a7a31/59712319662.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/dajipejisu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5952832d836c5a8f4b105f03b12b09f5/muduvilojit.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c2e07a50---91584267262.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bff1dafab---pofiwo.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210716084344122.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/68364203180.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/89541324423.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8643885iaik54rpb7c2nc4p5qb/vikosavuka.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/26909598290.pdfIn PDF document text
    • https://majubesar.info/contents//files/rifux.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/44017822473.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/tetuvenosozizetuxamufe.pdfIn PDF document text
    • https://quizai.com/uploads/files/27398825708.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91138766923.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/398cbfac46839e85d8ccff9e5f896f5c/99307709717.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdcd56a2f3---tedezo.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/64301560503.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/sinuvonimepitosupu.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/tipupilegokoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wordly+wise+3000+book+7+lesson+15+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 11096 bytes
SHA-256: b546a6355b9a343c0272a0747381a8dfbcfb4aa0be88d0e8cbd3e4ae5383ed8c
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 18132 bytes
SHA-256: 22a95f0598ae990a0be0c6fd3a5cb58760635b1bf12708abd94f67e265e05988
font_03_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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