Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c04b47b2cd2842…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 13:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07bf873e5457a378ba955a3362e2d201 SHA-1: 591cb69f09548033d90be066892026d54b4b3f97 SHA-256: c1c04b47b2cd2842d74084e0416c94efb8be8af8e7b624bd8f3f1062f6338ebe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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 https://laborke.ru/uplcv?utm_term=movie+torrent+tracker PDF link annotation
    • http://china-hold.com/UploadFile/file/20210918162803488.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/temamonilaka.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64823223712.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d287b8f7d9---gavifulikafinavosixu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/tomebifolaromuxox.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210908215847493574mlud7.pdfIn PDF document text
    • http://lg-palette.com/upload/files/jejufuvifojimutumugemu.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/51429445945.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/18006964878.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/2575974760.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210924191838.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/20575986579.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zajijelogomovud.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/2617654561.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/410817784.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/badexolajetozu.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/60597265266.pdfIn PDF document text
    • https://ekransamara.ru/files/nikutufokog.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/kepejozutikubejosawog.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d6e622049e4c889b7d5d37f147079d8d/zobugagokeboniluruzofajev.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/98182803358.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/45653031304.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f58e155979---sokimuvolunilovo.pdfIn PDF document text
    • 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_off0000b3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FA 17508 bytes
SHA-256: 39c32aa65aefcac4c158285ac12b1c3500064653d29798826d0a6833fc656b2e
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 10160 bytes
SHA-256: 53cc66fa4aa275e6d1f5eb09029833f5827ce066e024bc4ed3efc262a335b52a
font_02_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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