Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a86f6af589cffc…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 15:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39f51af021821952a445cce2ae78dadd SHA-1: 5ec796fea7eac50cb0209c50abc9daedf030c643 SHA-256: 98a86f6af589cffc7ca72d21da1f683c8bf2d095dc6354071836c8a7ceca80b9
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised WordPress sites or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://studiomontironi.eu/userfiles/files/52892012939.pdf In PDF document text
    • http://onfireinteriors.com/userfiles/xarawajofedidodabifoxet.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/welujaka.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/90273089914.pdfIn PDF document text
    • https://esz.jp/img/editor/files/14697329898.pdfIn PDF document text
    • http://montesantangelo.it/files/files/26992680968.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/keluneluledusirubododizu.pdfIn PDF document text
    • http://haki.vn/uploads/files/39069685966.pdfIn PDF document text
    • https://wsbtitan.com/images/file/36523562906.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/64206574465.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///59808957950.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/zijizesilimopos.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136da5caf46c---sanul.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210918113328.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d28779c22---94463475131.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/21306427933.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/zigubobavowovogalawuv.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/lifirizunuroferekur.pdfIn PDF document text
    • https://deepex.hu/hirek/files/fusodobo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614030c84ea58---fuvutedemenutumosowemepu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d785e8855---zetonepofazijizafo.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/zibod.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f788556e11---30112974073.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/siweverewesof.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/fotepijud.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/23814812610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=recovery+mode+in+androidPDF 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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 10444 bytes
SHA-256: d8973a6a05118f2cf3c0e415c36c2029baea6837dbc99fd34aac281a4c198124
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 18024 bytes
SHA-256: b610c23994f9683c4fbc0c1052aea76bd8a8ab8cb72d76829f2b964cf632415e

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