Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bd7058c141e5bc…

MALICIOUS

PDF

96.4 KB Created: 2021-07-02 20:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 255403a6042dbdb42421fd8b84ec0565 SHA-1: 5ad1a263e0c96b90866c42d2deac87f188c908c6 SHA-256: e2bd7058c141e5bce5e92c1fd2625f7b696c5d3ae04a494f62e2784ee1c6035e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://laborke.ru/uplcv?utm_term=java+technical+interview+questions+and+answers+for+experienced PDF link annotation
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb9aac174---76692239505.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb92b63cb---zikawopovubejudurizovono.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5c3e901u0grn7e8d7q93kfqeuh/jijepujawexujukuvurogu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085241052774---tipezujirap.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7684f797e32e987b04696b7979b9f10c/30232958539.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/71608271206.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/legisozukowuzotiwinegifo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/tiradonexejekozo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c5470835bdba8e04e3cca4bfa4fd3220/22598122577.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/20102543979.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8ac5482e---lujazikukuj.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebc0084b5---sigubolufelerusojekeralen.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5858bd9b6---tisuri.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fc6q6des25osf70kasc59ohn61/susozapedijekoxoder.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/nibimikudaga.pdfIn PDF document text
    • http://ha-sine.com/d/files/wixud.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/67490d8489ecfa0bb290cb68f181836a/momasuxutitizivezezunekob.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/gomenukuwudojixeridegug.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ac5544d4---55882256013.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/bubagavedar.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/91994601778.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_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C12 11208 bytes
SHA-256: 75931ff93935beb3077d32f1953882bc699ab43e348b7e197716288c0242ed9c
font_02_sfnt_off00014623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14623 17528 bytes
SHA-256: 671e23f32d728079ed1274fb9b9e31564cc6f8c7d515907d62212b2b6272735d

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