Malicious PDF — malware analysis report

Static analysis result for SHA-256 376eb011ce301240…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 08:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2739e0b8f38b623520c52a0d126b229c SHA-1: fb880fe13b4af7a0888be5a30c29761d2af8b5dc SHA-256: 376eb011ce3012404f76f871da047037686bc8bd4ce76745772fdd839eccf877
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. It functions as a link farm, directing users to various URLs, some hosted on compromised CMS platforms, under the guise of game downloads. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious sites for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=god+of+war+psp+game+download+for+android PDF link annotation
    • https://nomaquito-travel.com/editor-images/38866223819.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/tapeganol.pdfIn PDF document text
    • http://vititanon.com/user_img/files/81381361929.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513ae4e8e1---jumazovevegawisidaje.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161395d7e8ed97---wonod.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cea1d17---16749359621.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/34644700051.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8596c9ace---5318620874.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/bofatupexukoze.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/fegokofogovi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a79573df---58568174403.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/33280382726.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gowapuxezofalut.pdfIn PDF document text
    • https://agros.net/uploads/file/5222010902.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/rojub.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79b9b4a04---nukagonama.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/89267247793.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaxodonetefumoto.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/66163881527.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/47434179994.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zobijuripoxujasosesazati.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/bopaduzowatepiwibomutopos.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378900e2e27---jakuforonewarir.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/79138773056.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 17168 bytes
SHA-256: 3a2ef0733152878b52240d8319d6d2ef9480fc9e9358d1af7e7fd40c75b2cf32
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 10868 bytes
SHA-256: a4c3d634cacc6b6f2b4b878908e1055d8004665b77bbf7ece09e5da4fa81ef99

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