Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad16cb8ecb34897…

MALICIOUS

PDF

86.1 KB Created: 2021-07-28 02:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3436f627a695b78a89ab3a0fa9b617b8 SHA-1: e10bf344c3cde85b4b129f228e1a1313e0198d59 SHA-256: 9ad16cb8ecb348978865e99b1025ebdd751cae74db5821b11d27e9d0d507056f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is intentionally structured as a link farm on disposable hosting to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079139d6f544---34193402635.pdf
    • https://candbco.com/ckfinder/userfiles/files/55889048634.pdf
    • http://vstarmp.cn/upload/files/20210613_170314.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jjqtotok0knfdaor03i1sphtb0/gurisusekupuwokofuvupowep.pdf
    • https://yellowstonewildlife.com/17122005003.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/tesixum.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce386020f---53674317341.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zomoruno.pdf
    • https://balajihighfields.in/userfiles/file/fanig.pdf
    • http://davidlbrooks.com/clients/868292/File/jisepumutixamuzigegapono.pdf
    • http://sanarina.de/ckfinder/userfiles/files/97619891046.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/20551812895.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/73i6r61dil5gqtsfsm1t9st39r/966016068.pdf
    • http://netflor.pl/upload/File/kiguner.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9qhvtonh06qdl01ps165ua06t1/48441970279.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b74fbfb65---putuzejexetupigodo.pdf
    • http://albertaracecar.ca/clients/49797/File/dofavo.pdf
    • http://isystem.hu/userfiles/file/55393713243.pdf
    • http://creatinglifeoptions.com/userfiles/files/59627619632.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaf1e9c04---77627376929.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+are+the+codes+for+warzone
    • 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_off0000eca2.bin
ab1ee3cae1ae7c374ec38903daf4fe5a7682436cfd44716c1fc7d5054fbeeb0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 17388 bytes
font_01_sfnt_off000119db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 16792 bytes
font_02_sfnt_off000131f2.bin
726a97256457a9df85f322587788ed77c4042811ae284846ab027818c132d0a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 10576 bytes

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