Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1797ec502754c95…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 14:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a30804dd843a2d4af32d671e6a3df983 SHA-1: a9406be59c7393977f3cbd11b3469c9358beb63f SHA-256: e1797ec502754c95331b8c7b2a4f75ce08b684c0f76e881f35143680bf6b3d41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or malware payload. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8113gvluif9rbcqpg6pibr9i6t/80599893512.pdf In PDF document text
    • http://blackivy.pl/userfiles/file/runukewubofovamizurode.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/59990392131.pdfIn PDF document text
    • http://synhbio.com/upload/files/97700118761.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/pejileximedopumapi.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/rokanewexikojowugamosasu.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/88015448521.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/53063292806.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109020243399726.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/3701449877.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/81450335660.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97746d14a---69908454495.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/147351980.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d34f1c984---zetagagulafe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/jbqu463hs9oind8b7e4tq9lg85/74613158008.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zedidij.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-12/20210912083415262108.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cv29q1rve66covfne37k4cbpba/fojizatakibesasigob.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/72076214363.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/vubumimiboxumisesavowuvo.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/jorin.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/60432432714.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/vizezujusozasubotopise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=watch+all+my+life+movie+free+onlinePDF 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_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 10604 bytes
SHA-256: 6991f5a8902b051b6356583bf6b4f5d458582f25fde7f3e816723850e9ced0fa
font_01_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 17276 bytes
SHA-256: 07781ef8a8e6f9e1eacd298bd876191660e3194c1d61a51ce7dec985e2df07a1
font_02_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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