Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef69f43f65793caa…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 03:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06d5bc715f32ea2175cd82682578506f SHA-1: 25a25178fbf5072d46936d5c31664f5d4fe483d5 SHA-256: ef69f43f65793caa8dcc520573f87416fd09a1510e07d337bcdc03ebd9c7a074
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://xingyeknitting.com/userfiles/files/18707216923.pdf In PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/paxiwij.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ghplcgmhl6d75n6hmjkv41fott/21125682632.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/texaduloju.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0opcsccadtsjogc843ndt6q6m0/visunejurakefibekazoseg.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375bf9ad020---22404720832.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/sitipezibu.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/61225368972.pdfIn PDF document text
    • http://nktrading.qa/file/files/zubaxumebokaxot.pdfIn PDF document text
    • http://gabortech.com/admin/file/26433649128.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/wutidafaw.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/53685323077.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/naburo.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/mofedutasegusiga.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16138303626010---71077189554.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/xorerovo.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/8314008390.pdfIn PDF document text
    • http://metallpress.info/files/26382842061.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/98ca3cc301195ccae989ff2d2aa5c091/loviruromunozedoda.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/mubezomikidomilibanut.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kagonixikatufanagixud.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/99608591984.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/79116344673.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b8877a4877054200b554574aa103baac/vaviturozamilenifum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=djvu+reader+apk+downloadPDF 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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 17888 bytes
SHA-256: 81aeaf67e9c351dbae887286d0740519f0a3e94b644afc592b0fbaaefef548f1
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 10504 bytes
SHA-256: ea3764fb04024319b69ec4fb428e690e8036702f582102eb4d17f994e0554241

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