Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ce69e90df894b8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 08:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 753d516d4b97b803806da9178e1d5a0a SHA-1: 475cbea1d1b1aa31f40ce5a21b38fd8783a0766d SHA-256: 21ce69e90df894b8a409e285b285e9e5e6c5e005069aef597e18c08c81d758e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9a7fc5f12---zewesurupafobesarizupo.pdf In PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/kogitatumofofawi.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/59221275609.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/40313867301.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109161821055227.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2aa959409d06b8e44bdb2e2bfaa0721f/25402933147.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/xosasarixubadureru.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/15062006025.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lknmfq2j00bip6sje3ucq64t42/16871921337.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/32967722910.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202199743374754.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ebohkpj3fig2go089lavdb6c12/robiboxe.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/31230866818.pdfIn PDF document text
    • https://premium-house.uz/images/file/jesafuwak.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/fakajo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnov15edggrpn04qh7kfdjdvrc/25641073574.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/98152406560.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/56738265750.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/gezame.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/11347452698.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/28556683347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=most+realistic+car+simulator+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_off0000c3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BC 18768 bytes
SHA-256: 562c7b2d15a3a8f35cc1e9c510ac4112450b3b11beb2c41f9c12017f5fa9ee89
font_01_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 10624 bytes
SHA-256: 09f0c5a3e5bb52084654a20f26b43f7f1d91bf6adac311e4069859b6d440c1dc

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