Malicious PDF — malware analysis report

Static analysis result for SHA-256 c119421575d6cf54…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 19:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 157f437617bd1850021ef8568df381db SHA-1: b91a410ed1fb2bdc9e830487dfcb1dc432008992 SHA-256: c119421575d6cf54d6f346a58b0d2a3fbbb27fd7725b8227105e2ce4900cf5e6
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript and numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=how+to+make+multiple+jpegs+into+one+pdf+online PDF link annotation
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/afcb9a33811ec4452efd6d3a2c9cd65c/24439989867.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7460ea40c3---jesulig.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/bozuvekokomonenezupimiw.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/70673414287.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/mutilogonuraxulobovufezog.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/93851719534.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49230cb96---pujiwimatugawarenurovijit.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/8c2n6vc0f2u17vb3333l7moof2/pipusutanaveminav.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/naxajalufagasasebup.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/47d876cc0dfcf20d8ee6e86d0d9677e1/16551766523.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1bd74a49d---xelakolusevedixo.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/d64qjcuesjg2ghqjqr84ichv98/53322096236.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/nafobelaniforan.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cada3f97f0248fa0506432804adc357c/liwazosukik.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc2298d2e---20506598193.pdfIn PDF document text
    • http://www.toptehnik.si/images/32382663249.pdfIn PDF document text
    • http://bio86.fr/fichiers/12098311450.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/41742208323.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/96436994315.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071769f1804b---85804532395.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5d230777773aafb34582dd5acca3ea14/zabegemet.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/98001423442.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2413a181a974273555ca295aac7ed073/78287406486.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/tidogurisavowotolu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075769009b36---litolibipilo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607533691768f---2270396551.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_off0000c555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 16468 bytes
SHA-256: 80086e6c6db3e5ec25156d2beafa5142168f98238c45534f68411e5ea28b3837
font_02_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 11140 bytes
SHA-256: 0d270340308a2a25627251f00776b8a08a8f911d1cd010f2ae8bbd7c96d85228

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