Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f8f8a660402ff8…

MALICIOUS

PDF

138.5 KB Created: 2021-08-25 17:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c7f39b718a349d481875e3c7b11eca91 SHA-1: 70b683d1d830dc7140edd9b6dc0b0ff4bd5e1fd7 SHA-256: a1f8f8a660402ff81d19c43a8f283116a9c37f51d2f1a2cf5b28dc7a546dff01
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document is designed to trick users into installing unwanted software, likely malware or a credential-stealing browser extension. Numerous URLs hosted on compromised CMS platforms and disposable hosting were extracted, indicating a link farm used to distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f9459172---wuvukejosemusekekososabi.pdf In PDF document text
    • http://nickels.design/ckfinder/userfiles/files/luludanikobiwojatobim.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tenugonenarifuzamo.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/gemodokinogoremaxiso.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3769660b60e01d362ca5d5a0befd0d39/38731847896.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc300c867b---69625464988.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4a4e7e113d8407e9c0eb6146492098d5/25247706283.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/woxurigoje.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/515e58e42d4b0863ec269599ffd80ee3/95345030773.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/52883549152.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6ddb77d9fdcc7e6cef64dc615d85ff5/nisimutoj.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b871aed6ffda0c8e9276d0d9ee3d6dd3/tigisetawususezakemo.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/zutiwejusiro.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/82652253933.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/71037118330.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/xexigavusuf.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2l8af5qbfnrtse0ulcn39s5grn/noluwanisupebajeruju.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/697824c1e77acabfd952ff2515a61aaa/tiximenabanudesa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091c93cc8b99---tiwif.pdfIn PDF document text
    • http://benly-carson.com/product/files/barik.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/vusinonamije.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/dafawi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dc40ba39---vutevimutizuxagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=knuckles+in+sonic+2+debug+modePDF 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_off00019564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19564 10796 bytes
SHA-256: bb09c7bda682e4435e226bd9c10909d0b4a537435debfcace53f047a667a5df4
font_01_sfnt_off0001ae08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE08 18992 bytes
SHA-256: 75e1d7474a5574e9d5d207a8e5475a0e08bbd0709f72e60ebef86b5985fc1f7f
font_02_sfnt_off0001df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF77 10528 bytes
SHA-256: 8c50ae248b58bc4b3b9d0346f1a69f12744bcbfd7eaee2e934d7362d619cbe92
font_03_sfnt_off000201eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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