Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f44150104139af…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 14:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dd8432d75c213b2b2353077ec73e3ad0 SHA-1: 60f1efe0c0ef6ef90fe8c179ba711b2e72f373ba SHA-256: 97f44150104139af281fea7801c643353afc1ed5e4d15a06b2fd2a7d5d25fabe
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely serves to execute malicious code or redirect the user to external sites, as suggested by the PDF_JS and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The presence of numerous URLs, many hosted on compromised WordPress sites, further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sk-massimo.com/js/upload/files/56213294017.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4bdb90bccbdfbfff51da469c0a116e10/ruximabuvedubuge.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9f1e3da4---46830170269.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/10769915377.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xojisimufevoxiwuvo.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4b8f35bfbf2e6f95c19e68de876c15aa/21944083299.pdfIn PDF document text
    • http://freeski.hu/freeski/file/fovopif.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/087a1bd8ee4d99d5d691a33e74ef66b1/xelukivenuzaliduguxetuvo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ofgic9h3r1n7kjlb8pd70uc272/balakef.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/93253893527.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/88327997416.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/46963810383.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210526023223_wef6u6.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/finupiparikalodativ.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/39309468101.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/42481599669.pdfIn PDF document text
    • http://findusafranchise.com/files/files/fazefavixaxop.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/56182964821.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/situmagabekef.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6136d5b139---xobani.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3f7587dc---6903266877.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ochb6b7b9hslv27bi6c53l12em/kezubilarasoxavataxu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafb618b28---93838700404.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/aa1c9d458cd732ec55d962a3c0963e7b/79377752924.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82ad24902---sasebebazewepos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=working+of+nuclear+reactor+pdfPDF 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_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 16580 bytes
SHA-256: f2088e74e80a840c0cf881fd42a16dd3e6daa8b348546c10a3acf1002a1724a0
font_02_sfnt_off000128e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E1 10812 bytes
SHA-256: e7bb2496459fdbae16400944df7e93337a5b638efeff66bb831a5ba509be60c9

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