Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6e2f473b2349fa…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 05:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04ee4b3daeb1ea3781c1bea4ac038ba6 SHA-1: 3fde5e79868df2c58f6efe48878d9492f5df96e7 SHA-256: 6e6e2f473b2349fa73f4a846e069388eaa61d005d8820b9e020e96b02036b12e
196 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick users into installing malicious browser extensions or updates. While no scripts were explicitly extracted, the nature of the lure and the presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicate a likely multi-stage attack involving redirection and payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://nwatchonline.net/userfiles/file/fegolukilisibuve.pdf In PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/zovaja.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b4a38243---54863709379.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160720a69d8883---rajowonaxuremozivetumapel.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094040f16a7a---xuvuvakimijikenej.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210622153232.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/60949691785.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/90622056794.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41ee64a41---ditaniko.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1d0548ce---xonowekosokonajekuruxabuf.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116dd890e395---bedagafev.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b85c99b18---36010567914.pdfIn PDF document text
    • http://rilta.net/userfiles/files/22054023141.pdfIn PDF document text
    • http://twilaw.com/files/files/86928487882.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/demagewukapijajarijiko.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/dimavavunulelalusezezomum.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/dubevidabo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b17336d4477905ec85bbda808a146c9b/nikatiwujuposiwemotipopis.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/welewepavalan.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01428b91918990c3920f4c85b3521b03/44210249791.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/19840433464.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ra6vn80542384j0lgh8dp3q1vi/81772087614.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/wapalarofanizek.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/jubexubadefelefajifojexok.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///47385054199.pdfIn PDF document text
    • http://ridendo.cz/files/file/57214348083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=font+keyboard+copy+and+pastePDF 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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16928 bytes
SHA-256: 91874e1d017a6aa85496c6683b52fc6134459dad35a1c070507f42f553a4d716
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10692 bytes
SHA-256: 245d0ddf6c14c22c68678d643a841d9f0c0d1db1b9cc972bfb9e7bd79c004097
font_02_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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