Malicious PDF — malware analysis report

Static analysis result for SHA-256 9779d9e24cdc0879…

MALICIOUS

PDF

108.2 KB Created: 2021-09-11 21:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6b912e4440362f5411c03d8f21a53e3 SHA-1: 367c660868a6987654c85b0b762e954f788650b0 SHA-256: 9779d9e24cdc0879cdd9c2dec8f906399f27d97f01af84925147c8570ba249b8
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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 https://smidgel.ru/uplcv?utm_term=fast+and+furious+9+free PDF link annotation
    • http://studioassociatoemc.com/userfiles/files/82677773497.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/17396637286.pdfIn PDF document text
    • https://noventa.cz/media/files/file/79635085122.pdfIn PDF document text
    • http://health-bridge.in/upload/file/jokupejunufoduvolibasan.pdfIn PDF document text
    • http://wajl.net/img/file/20219421553.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/rutedotetodet.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/68488019897.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa592f6a6---remofopuramibodupu.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/49592881167.pdfIn PDF document text
    • http://fullx.net/files/86871686418.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/suniwuvoduniduzib.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/moson.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/tixezuwobadoti.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/98858098914.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/nogorinuwunimelubakeserov.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/86678122506.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nodowepiriximatukivemeke.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexesazixikepogaw.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136d60f3bb12---nilewu.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wewadavo.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/64171362875.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibonuvifafarifamekot.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613261500535f---vavabekuwaxujugaburib.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67848666582.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/69290260644.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/2188879467.pdfIn PDF document text
    • 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_off00013f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F75 19716 bytes
SHA-256: 9ab0804a8e82342b07232fccb89e654610e145fbd04ee2605bf315a5d441df3b
font_01_sfnt_off000172df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF6 10544 bytes
SHA-256: b3a50f0d78821f8038366e849672c1ff3e96d97a45bbc98a8c70a6a333172662

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