Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cda909e296b1b04…

MALICIOUS

PDF

88.2 KB Created: 2021-08-15 03:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f8c18e23262b8a0e01ce99278b7e64e8 SHA-1: 74fded9bc233d2623fa00de860a89b2103c3f2ab SHA-256: 7cda909e296b1b04627024d22d8c2ccdb9feef665ef16680f5eaf66dea93799f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links designed to manipulate search engine results, and the presence of 'utm_term' parameters suggests a phishing or redirection scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=periodic+table+webquest+answer+key PDF link annotation
    • http://9meclinic.com/ckfinder/userfiles/files/65616494239.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe5d615071---36233462306.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/72848062038.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a7f6cdf78177a83da7c77cb52fce0d15/pakodalewagamixovow.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6fa88efad57f89e37908beaca842fc34/48254099507.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ac7ab130---laturenitopirin.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/pimabo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/em74r7vs8d5kk5j2k8veg1n3i3/batenajisop.pdfIn PDF document text
    • https://tavio.ru/files/file/merovifamaxudexuv.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/gadobasokixibowi.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/mirezapomejesisalawapu.pdfIn PDF document text
    • http://limoride.net/gallery/file/ralisur.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/zugonisapafinajidexuvusal.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/1689495712.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7fcaf28c---85625278662.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/76201118034.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2195bc68b5---wigetivolizebu.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1dd40c47ca2152fcf601c79750dddf7d/virozowosudew.pdfIn PDF document text
    • https://podimercrm.com/img/files/rafetamajuni.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/vunadajigenonenuno.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/97842201349.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/26389584665.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/18c0375b82f8281d6eb7b31b94506c58/55825192659.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_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 11044 bytes
SHA-256: e731feef55b75e2a79c59cf887165b5a27e1c4cfd306a166afd3ff740366ee8f
font_01_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 16992 bytes
SHA-256: 81ffd4727b4adf21e487ec72f88b686a641744200a71efce9afd6a9e0dd5c60f

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