Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd43483d2ef2258…

MALICIOUS

PDF

89.1 KB Created: 2021-08-22 04:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 916ac92b02a4039c1d6979dfb38da179 SHA-1: 7edd71a5886b7ca763fb3ed14318831f5704270d SHA-256: 5dd43483d2ef2258480b0e9cffef55bd840e9dae8b4a1ddb17820bc2fac05cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used to funnel victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://glbtrader.com/userfiles/file/73014048678.pdf In PDF document text
    • http://biosite.ru/images/news/file/28290853357.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/buriguxavuzidobomaxasij.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/5744997000.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dc541e423a2d43667a47fc35060ac5ca/31216469663.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/mapipunezakuxegawonosexo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/lesbnrhinrq40n8miur986faq1/jatoriruxojodusudipar.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/20962668059.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/28863215687.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ab2e8a394---supabarofediwaton.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2cee09d5c8d8bd4737642ef93349c817/63443818527.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/pemomagij.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160948c053428c---6365544038.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///74621961731.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/305g0pu3sb33sjqfnqj05ta7o9/33393910320.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dd8089915---49466455245.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/bitofipeduwibibovok.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd70373e5---54616429669.pdfIn PDF document text
    • http://giga.sk/storage/file/71802965150.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/mavoge.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/95092590752.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c43f6b0e940---paturabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=la+belle+et+la+b%C3%AAte+questions+de+compr%C3%A9hension+6%C3%A8mePDF 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 11760 bytes
SHA-256: 45f9f93f3a5b2a07beae161747a9c65bdb9bfeea4992df0905494521786493ab
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 16092 bytes
SHA-256: 5e4c00560aa92e58ed7893f1d29e19bab1551ecfc1a2d4366013d39ff1dff337
font_03_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 19904 bytes
SHA-256: 3c7615d84eb3314af4cec1e1ec85afea783ae09754b99b4acdfd93fc093d9638

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