Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b9b2f1e0e54572…

MALICIOUS

PDF

110.9 KB Created: 2021-07-02 08:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 02623ca45249fc9fc477224bd982a540 SHA-1: 700291f16dc08449ec4de5cf7bb360f7afd9a0d8 SHA-256: 89b9b2f1e0e54572e0cfe33c2ed1e8af9a7b27d429f4aa04ef335d019d4f0817
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO poisoning or phishing. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. Although no scripts were explicitly extracted, the presence of PDF link farms and the lure heuristic strongly suggest an attempt to trick users into downloading and executing malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/xazidolikidar.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/33ngsnr1efca1vopr3cb0gqq72/18853776998.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998216b4462---wigevonowonafuza.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6dshubnn378cltckdgqeglk5t6/fivazatutegiko.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/jujibekakumidamenukekar.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kutipamapukofosijav.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8e939cae---94955082261.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe318a997---80950119775.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607038203f2e5---45349039144.pdfIn PDF document text
    • http://attlas.center/userfiles/file/67715957036.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/12551686574.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57939404316.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afbdf8e5c38---91550476886.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b3e6ce260---97449371795.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u4u6ogo27hspacdkjq1bmkr2cf/bibilajerabutogarowalirel.pdfIn PDF document text
    • http://mmcaana.com/clients/29274/File/nedijavejojedimobafezezo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4d83fd982ddbfa531b03ec8f4bdf7ad9/bodug.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tqgqmst88drkum2qe76srrj31c/19608906969.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/28036246525.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kaxeselimefujoje.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3125b6e1---pavomupozeronova.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/lirawemevetadovewamosezu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/942tlie8dhmb302bp80rb1cuuu/11612401847.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b82027e---kojozisev.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/gopifetapabajisaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=polycom+ip+6000+conference+phone+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 21512 bytes
SHA-256: 0fe2c0732523b46e9ff1215c0589444431cc2e25c855755ef1c59d0bf677fe31
font_02_sfnt_off0001640b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640B 17396 bytes
SHA-256: d9662d6714c795dea171a2214ffe1a3e44647754f0e2c80ae3b937ff3decab3b
font_03_sfnt_off000191fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191FC 10984 bytes
SHA-256: d8a7d65068c304965f909dd02f2b650349ee5620617bc63e3f3ff1ab2d943198

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