Malicious PDF — malware analysis report

Static analysis result for SHA-256 6566d43f72456a7c…

MALICIOUS

PDF

74.4 KB Created: 2021-05-07 03:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 83566172094a9d3c641e7eab779aef82 SHA-1: 39dd269650d173d8f282875366b909facf007376 SHA-256: 6566d43f72456a7c1417898855ff6829b79111b3a2826e7e948e6141083ff0fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to antivirus software, indicating a lure to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=miglior+antivirus+gratis+android+2019 PDF link annotation
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/af63a910fe6ce9faf17bab2c26145b14/19639460299.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/25433473744.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4b096887---61407349436.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160778cee993c8---13274009036.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6b2c7407---lezeke.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0aaa3a31---63314542518.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7133c7afdd4a9547bcaed20c489d106b/97816897035.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/88q12e6ng0rse485sr8icj6v07/7312616768.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4r0d049f3che63or2j1kle7njv/70397848490.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/045c19af1b5eca80f5f5204e15280e88/mezig.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/44364af232df66a759911820c658ea6d/6042872668.pdfIn PDF document text
    • https://airbays.com/userfiles/file/80963620796.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b55hepmlquavpoh6hj04t515h3/23267363191.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/vujemalokudobexifemufo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jopimoxolu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f654ab3ae7287227bd995c8737eab24a/sikabufuvuguxevepazesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 5540 bytes
SHA-256: 34108e3176167f64e4c813c863143a30145fc9497e4cd07d5390a145bd36dca2
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 11536 bytes
SHA-256: 68f58a3e493f633b23cddb9892d5a737ad5254b2679816b74e51822b7a1c6dd8