Malicious PDF — malware analysis report

Static analysis result for SHA-256 6791bd951f3f2fcd…

MALICIOUS

PDF

78.7 KB Created: 2021-08-05 22:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2cd846f720765970acb692036506838 SHA-1: 88777efd000b0f2539baf0a8ff60064c1b274ecf SHA-256: 6791bd951f3f2fcd909b18e4b5c33797a6f50d86122464c69cafa6d13d4c7f72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URIs, many of which point to compromised CMS upload directories on various domains, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential malicious scripting activity within the PDF. The presence of these elements indicates a likely phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/balejatalavejotezugizera.pdf In PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/tufexoki.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737147049a6---jewot.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/13ov80qnovi811u6qdh8t62h8u/2514526838.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160be5573c78ac---lusolotijukojisemusudu.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/porozaxosofakagak.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cbb40dcda5ba2bc8ed1790373558cbd0/66977724354.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e34d4f514a4759b9386ced2095931fd8/duvodagekurazulorodogut.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/88970451562.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/vivoxariwokedezunupim.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b63dddf9---fugozogenozetixirimuvupug.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/nabapimuzupu.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/84770146282.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bododetufonipasub.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fonam.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ralomuluvubizuguji.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/27956014293.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a193e965b---jiratomilamevobo.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/39939504315.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf00ee3c0---ximunatozonasepew.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9f2ei857skl58dlo85s4tbtcv0/11223682372.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5dd0ad652149b5a6a923ada43f92bd5e/meludo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kovboy+filmi+t%C3%BCrkce+dublaj+izlePDF 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_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 18872 bytes
SHA-256: 760d966f615b644421e63bb7d0afc49c9a57f4724aa04592bfbe37a8f74d5c9b
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 11252 bytes
SHA-256: 8bb6a94e6dcc97485ab3fb04041cf36a540907eb794319ea5fe1a07b83617513

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