Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76630c9fbd5fc31…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 09:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de1c2ea685bc602de097d4c4c1dace31 SHA-1: 011477d27a355f4cef34b4c5699d165553a6c77b SHA-256: c76630c9fbd5fc31583f9f18c8011bef109d1269f595b8267bfa2d1e8a8a9278
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, while not fully analyzed for specific actions, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=telugu+crossword+puzzles+pdf+free+download PDF link annotation
    • http://lahma.pl/_u/userfiles/file/tasazosimodezori.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/5047059210.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/53313895482.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/11916356792.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/79952015069.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/88257630518.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9b904440ae02171665b3992de99f524e/motunijapu.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/38401024216.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zojexededowazegapewogiket.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/27723687976.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/84823387057.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/88454040784.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/dixunu.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/ribatimovanoji.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/92104567589.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/tazufilizexolibab.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/kudolajemaw.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9349023d---80668546519.pdfIn PDF document text
    • http://poiskvod.ru/images/file/foluzu.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/4e655786f78c691b11034e357d5ebf47/jusisefavutaxiru.pdfIn PDF document text
    • https://venus-forever.com/image/files/23723136231.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160979020d0100---wulojitivabigomolodajez.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/lexexo.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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 10816 bytes
SHA-256: 5556b4e3b04ecf0de3df86695070893544927397c44589a3ec9109e8063105ed
font_01_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 17004 bytes
SHA-256: 8ed5ab3332a91a104febeabf09ad5f7c25c3ed0850392e9a8b7b1aa2aa9a4913
font_02_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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