Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce28a20d0a3dfda4…

MALICIOUS

PDF

78.4 KB Created: 2021-06-25 13:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4c89a49c8f5db0d1e2511f2d4af61e1 SHA-1: 5136c5f38408aeba1e7f18e781107f250b2d769f SHA-256: ce28a20d0a3dfda4155f3ca32698dcf32cc6bbc00aa2762e2f71cebe45d8bbce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://philabc.ru/uplcv?utm_term=to+cheer+you+up
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b61107865013660440b4cf96b9211ca5/10457206746.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/tabujofex.pdf
    • http://sjar-tech.com/uploadfile/file///2021052817310772.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d9ed194de2401cb25c9eb89e52a9ad46/48276486875.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082430e6a8cf---tonevonaxavolaritesomuf.pdf
    • http://ayurvedicclinic.org/userfiles/file/xezawopijurom.pdf
    • http://esipro.fr/userfiles/file/xosebuv.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/gowuleramaminuwifibin.pdf
    • http://chinazzjx.com/d/files/98251415234.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/80dea41f66f84e90f4401ae94cfffcee/towizuke.pdf
    • http://aquatherm-graz.at/files/famufokijogosedemi.pdf
    • https://svingenieria.cl/userfiles/file/dasiroxusedafazowikogesol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 16792 bytes
font_01_sfnt_off0000ea81.bin
668ca5c075661e0275b8b8c41172286a8b4db223703940a961bfea8836558244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 9976 bytes
font_02_sfnt_off000100be.bin
51b3100998c4b4275717df141dfd316e5d5ff5fdc28d6327117ad26f1a7771c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16944 bytes

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