Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4a7ec9554de7c9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 01:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da12120c619c4f33e8a4f07ac63075b9 SHA-1: 3de31389808651f0894b23fcde8a72cc0828a949 SHA-256: 4f4a7ec9554de7c96d78340aedfa8d198f010006e835494087da2c78684b780c
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains heuristics indicating it's a link farm and a lure for browser extension installation. Several URLs point to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://hk-bbc.com/upload/file/rejex.pdf In PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/bovivebuzozanimidaju.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/bodugivujixepoxozejumaw.pdfIn PDF document text
    • http://orderkai.com/uploads/files/71267356684.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3852ae16f---naxodawixegag.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/zibafegagemuxirimafazuru.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/xebigukizabopadasabaxuvu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/gasuxajaz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b63f8d7f850---depenoliwibafane.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59587239844.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/gidulefevelalutanokag.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc04f4b349---rerukeranajesevigajepuniw.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/49751591275.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/a43b936b0f49d403607621a5705c0626/rozuzuwupilelu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ragaxomami.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/b73cn4tmohhtdgpreqr8u756s0/jutagipapogu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610729611546d---duravuxadepuz.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/wifuvopagebemovekozamekal.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58923070958.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0rnoshgacqfftkjiflecitvjt1/11325816275.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/8321309308.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c56cb5d2a4737efbc1753438da1be194/vaxowididifamina.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/20668158239.pdfIn PDF document text
    • https://geniodelweb.com/file/371047910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ark+resource+map+crystal+islePDF 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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 16508 bytes
SHA-256: 09b92fd5baa1a88d13f5d000966b88be36ddb531917971f28f6c248ee8c959b4
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 10716 bytes
SHA-256: be814295ef6813c5db73f4622b093373b09f4c9f73cf4a95eb88ef95a3ab8811

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