Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2a97025be314fb…

MALICIOUS

PDF

101.5 KB Created: 2021-07-02 06:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62aed79519f308153b38b8a288ec4fce SHA-1: c5c745231084666259a47402f1b26397094d26bc SHA-256: 7e2a97025be314fb7c8f6d3168039baf087de0264c3f6f19cbd450486cadae8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://carrasvilla.es/uploads/files/xopitekirikulatoliruba.pdf In PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/988825187c302645e9914b259921bb86/56182363097.pdfIn PDF document text
    • http://airfa.it/userfiles/file/movafof.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/61m8l9cv1m03pjmj64mraqvel1/sesiwafisukatifo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/1hgfl0gc5o4p66p8j4uf0ve8aj/gijokosavupanetumuki.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/disodoji.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddf956250a680edb5f331d5381c53002/majixuxogolubopopapu.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/fivepefupogogavuxawetekok.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28ebdf2ae---21883587049.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/jakafixepe.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/pofibulosififisebedeta.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/saramos.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9dc1777a2b911e4d8f4d6d68ab28fd9f/bapubisaxokizuxumorowak.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/28191750243.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8bb4a812a70749699d85dd9362e683a3/minomirawuvisagevob.pdfIn PDF document text
    • http://dnepropress.net/files/file/17362651869.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f747dcc35---46896651413.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/52239783257.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85307afdc---9436612163.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/43874843278.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210618003238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=powerpoint+slides+automatic+transitionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012658.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12658 18428 bytes
SHA-256: 95124afeca84b7ce39b0b9b7a7d768200ed31f73aa803a63c88d562c7c2d8763
font_00_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 10864 bytes
SHA-256: 41b541b07206b66af0bb71b9b6ab5b5e7ad40307c5daa1b561b1973a699ca09e
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 4040 bytes
SHA-256: 5accd28b93f88256231765d54412dfb73b7c8b89e0db92651776be48329af4d6
font_04_sfnt_off0001446c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446C 27164 bytes
SHA-256: c53ae241568c4eaa5b34de20892839efc219f5f5cc0d3c4096d3475505902836

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