Malicious PDF — malware analysis report

Static analysis result for SHA-256 83979efd98b2f544…

MALICIOUS

PDF

69.6 KB Created: 2021-09-02 01:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43976fb748ecac8df9a520e9c378be9b SHA-1: 9299ec39053c6cf7d87a848ffbe6d32c95fb174f SHA-256: 83979efd98b2f5448072ba209ab17b35736fa74d3fcbc306fa1a2f4b577bb974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest this document is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=glutathione+is+made+up+of PDF link annotation
    • https://erdenetpost.mn/userfiles/files/sagufisexetamekeserepo.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/duwibunujis.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086861be456f---86043313276.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/10730611839.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/27285700096.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75564f8d2---pakubig.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f90465ab222e73ce695dc8fc4ccc07db/rokewodiwilut.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/zidibageponubanez.pdfIn PDF document text
    • https://beautydent.hu/editor_up/3753984482.pdfIn PDF document text
    • https://papiratisk.cz/soubory/25586087676.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/8130073643.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8qdg3qob51i5rjr958hs16ad5r/zobikaladijiwipi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ea6d6221ef14b333aa4ee06b810b114/bamotidopeziketegojis.pdfIn PDF document text
    • https://rosycaffe.com/file/sasar.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d390cd11ec---23423003201.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612d24f20b72a---sodexite.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/levunuxejizasopekikul.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vuvixelozodoxobepinapoz.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f75a952f2d49025fbbea06ebee3760ab/bejowuvunuzobedu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d81e4aecd2---wodegigonufevetolutuwev.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/82637342959.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/31937978919.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_off0000b07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07C 10800 bytes
SHA-256: 9f721caaddb9d398a446272547076d5fb02ffe7642bdff120cf34e6ebdb5cb13
font_01_sfnt_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 15228 bytes
SHA-256: e86e1261afb9f42347ee9b06e7f8d99f67eb6cac4bd5ba01dcf2c52ea4f0f834
font_02_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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