Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e2db12aea01ebe…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 18:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00cae642a0ceb414e6db88e5dde2568d SHA-1: d11ae19e8f900b928b93308f5ada042caaf04d72 SHA-256: 71e2db12aea01ebe848abb696e410c2b0b9a5faf5d7cd0df7c512ff734fc7b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pixomot.ru/uplcv?utm_term=rival+meat+slicer+instruction+manual PDF link annotation
    • https://haltia.mx/sii/ckfinder/userfiles/files/zumanupizulezuwipijesefep.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t3l4j58q423st266qhbpcloh2f/nijiwogafi.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/leturagexurijebavuzinew.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/jifutadite.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe37d446a6---40150545062.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf950a3abf0---95995365279.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/74168018318.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/381436ca3c7e94b4da8cdfc46f8fef99/xogijenizedetibobedefu.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/50965522619.pdfIn PDF document text
    • http://russia-ex.com/difuxudo.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/be9f9d606022c58c6413a6e69bdd651e/pupikinisot.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/94272093014.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/jinapijelinoseralogaw.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847fa54ed8d---8732007277.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f96234ca---75318206517.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f7f46752---bifepasew.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/xezupevalurosuxa.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/resokupajokomugatanene.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f77233c80---janivoruluxezimaxul.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/0hi5kicdsva6srcca5416ja68g/wuwoxabekirodiw.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e8509dab4d097e19acaeba4cef3caa69/4920368169.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f44e008dac463b134554bd3530eea9cd/xafumiku.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a744c783655---gozukumeverevoruvadamudum.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/28941582895.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e22b760d2---midoxovofip.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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 10604 bytes
SHA-256: 949d479cd216e17c4a92927115e16d143cb27351a515a852189cf5874a40166a
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 17788 bytes
SHA-256: ec32046c88338762d9560652c913090d27d76e1513489328535b140954e27c26
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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