Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b84db1e8c29c61…

MALICIOUS

PDF

94.0 KB Created: 2021-09-07 19:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 308e2f1b673f80f2702aa133c85b1073 SHA-1: 2f4b9d88fc89a5e68e2746191121c1c52b33f191 SHA-256: a3b84db1e8c29c61973a624e4dbef590c3867fdba2e737bd5ffa206b0d488562
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, often employed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tskrea.com/userfiles/file/ropufo.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e6896a8d82fda3add87651ead1e34e0e/74527977943.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/wuxavazif.pdfIn PDF document text
    • https://tivicom.vn/upload/files/13332827624.pdfIn PDF document text
    • https://auto826.com/uploads/files/visepateso.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/23751632742.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/zalilosibutojomezomimidu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fiheoh6e9816r4pg3suak4jj7/6970672001.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/dilowejeg.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4110a6628---62449937052.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7f49003d---vikasotadalupu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/97932982010.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/metovajejibukagij.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612955e9236eb---91799875871.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa22b0730---diseboxezofopexalogiza.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/vusilexovevifetow.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/74583474958.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceb6b0d69---12164525117.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6c17992f---depajav.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62bea0c14---nalokifixiroxe.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f2702b34f12bf6e6a9d5851144428845/ranaxejufufawifasarojif.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/25914698455.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/nedepumagefav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=architecture+history+books+pdfPDF 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_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 18696 bytes
SHA-256: 7f8b71d18116cb960629d58376a4ee0669a2eb18d511db162d1c02c77be9c83f
font_02_sfnt_off00015154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15154 10832 bytes
SHA-256: 58854888bde30f5cde6ade987b9b6d7b3d9db7333270ebb4227ea48957e821e8

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