Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb5bde1e2bffd7b…

MALICIOUS

PDF

85.9 KB Created: 2021-08-20 16:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0789f5746b1f81036b40513da2a13d3f SHA-1: 6ae7742b5ee192c60e9d7bd980128ddc50a3d87a SHA-256: adb5bde1e2bffd7b4388270122263256d0b9469b944f05e41cd8c521bd4c31e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://hamzakocakoglu.com/userfiles/file/71894025021.pdf In PDF document text
    • https://actor-conseil.com/files/file/14111434817.pdfIn PDF document text
    • http://skupka54.ru/upload/m/totajijivosawiga.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/48719311120.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa8ab1e3e---bobenedobowerigozomawafad.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/denabafalaxipesif.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ac117901cf1cc254f917826084c7f48b/lakuxilubawokegemabimuma.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/tabesibijojonosanuxu.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/sokewunurun.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23c81344b---danarugerizugupowowakovaf.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03ef91d15---95080760747.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/dusoziwa.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/sumexumedewomifo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad353b6293e---89002576281.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853a35a08e---sokuxuvutumilizezepepixij.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1e560c022b7a4d2454524e0f7c9652cf/23489786550.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/budixuvosibo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f9a37d6cf---rupozuzogifobuvibu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160744b7d3f09e---zuxopu.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/rojebuvupikikerufe.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/98102957584.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/784a127f5effcbab8639a4ee3c80d88d/72120240340.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7mdd4avineq5avs80h2sj3j3re/redefawipesoke.pdfIn PDF document text
    • http://wenxuezj.com/images/File/bukuvanalopiraworojibes.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0211b242c8---zusol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+a+good+diet+for+lowering+cholesterolPDF 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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 16724 bytes
SHA-256: 9b215ed88ce8294d58fc6585e51de99f5b5f4e64185cac3ff8ff593a65e31b99
font_01_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 10836 bytes
SHA-256: c4e5676963a47c8a7d038a750f5bc473d66cf57ae30fd8e9159ff8283d9c2e1e
font_02_sfnt_off00012f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1