Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e5c8ea2d545c78…

MALICIOUS

PDF

70.8 KB Created: 2021-05-24 08:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be61654a6cbe196ac16217fc46ebf388 SHA-1: b6c389bcdaf82ecd3b5a439107ab1c3379c9046e SHA-256: a9e5c8ea2d545c78c354975edfcf07d943003cfc0c4a1e7278ed5f2b6369ab55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the URLs are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=hello+brother+telugu+movie+full+cast
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8db9ec5e84375dd0edcacbb226362f05/samiwinixuwobo.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/pl3666tu7f43j6i3f291urir1j/95366936364.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da51c20f2---96830224418.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2898fa4eca---bisituforon.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/147dc8edf617068e2ec1a29689f4f90f/56777823654.pdf
    • http://adabaskimerkezi.com/upload/file/zukogosugodatet.pdf
    • http://airconbank.com/upload/fckeditor/file/24781943789.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5a908b0a---69107626830.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1bcdc03b3e3dbe8ce172b96bd56ab1cd/werafejonewefojuwata.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da492126f7---dabikewogaxapeti.pdf
    • https://bloomland.com/sites/bloomland.com/files/nakesavan.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd55d42e00---xuwupebajadu.pdf
    • http://progfin.pl/userfiles/file/47574601832.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a447049a1d72a4a1f627254778076975/63333439732.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce60271437---91003338859.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d829.bin
4602d61d38c90d82883cbb51f3957b35c9191e46cb1f0f00cfe2453a7a2702ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 5456 bytes
font_01_sfnt_off0000ea9a.bin
6b61892cd724aa0bd4db9f509ff3d061f84f3a34244bc00a035dbd6ddecccfd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10468 bytes

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