Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f8ac57a84fe762…

MALICIOUS

PDF

88.9 KB Created: 2021-07-01 17:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5b79d56fe990a5656bc50a525ae0491c SHA-1: 4af2b82f78e18e5ae4e6ba712f896f415e9cde13 SHA-256: e9f8ac57a84fe762afad4eebbf3a4926f5be850a9bfff261ed7f12984fe0cec7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised and disposable domains, characteristic of a link farm used to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://project-lovcen.me/userfiles/file/22951528791.pdf In PDF document text
    • http://12shio5.com/contents//files/malixuxu.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/nalar.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e5e418a5---kukuzibapifozan.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/4238618159.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/g320hkd7tu9jb0aljuh8ro3gr1/radofeko.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/q5rjm12kgumbmf0lq4p0sebof6/luwalaz.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53aa76f0e---kifimevunorunexazagulid.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf731c73d03---dabamolik.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/32250664475.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/tupowonafugemalozufizuze.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714c6a3c416---71206998342.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/45107788688.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/24906897813.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/574a2dc9ef34a13200ad6934c9593779/90951818599.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d223d6e668a---wedatupuwebinidu.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/peloxotukosusop.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/murite.pdfIn PDF document text
    • http://metapolar.hu/tmp/zapupapaguzonomomokulopan.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tdrjhc3c7698u6641bf5cngld5/jalurivus.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/nurasirakinunifozi.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/mizodojakesirizaguzuto.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050317305973499.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b04bd85a---kiwilun.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2u7fkl5lejmmcvqicb90pe7knp/rudusema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=neolithic+age+foodPDF 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_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10360 bytes
SHA-256: 065e78135c1c90bef8737abd646d10769bcc5c142c5a2b23ab4b04bbb19f8d17
font_01_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16860 bytes
SHA-256: 8c0b2a6b89f3061b86d310901a9797e4cf1f751b519607c24b7c528adf0ad198

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