Malicious PDF — malware analysis report

Static analysis result for SHA-256 2649d29bdffb1255…

MALICIOUS

PDF

93.9 KB Created: 2021-08-11 08:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: eebc125c219447a71c50b26be3fbc1ed SHA-1: c0a040a6feec77e3bb91d040fe4db066e688cec5 SHA-256: 2649d29bdffb12554ab5041a39c7eb173b2f15c04fb5e100c794db00d711a5cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ngoctraithaibinhduong.com/uploads/news_file/moxojir.pdf In PDF document text
    • http://polkovnik.su/upload/file/zinazitomazi.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/masinurunazoribusupa.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/sunedawugeviravero.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/60873374241.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/67386612608.pdfIn PDF document text
    • http://strandedtattoo.net/file/2964799941.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608974efa8b59---69633394614.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e658d8e37---nikibifaxujuven.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a46fe8862dd---zatuwakidefovir.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107eb328fb---numexow.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/1661355165.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9831dbfb9c---98594956590.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/12927834332.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wititutexizosazivi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/af2dbbf28c079e7100efd381d8cb1e36/bapirirazikirelawuxe.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/69103375080.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d95d5717---rutinurifidukepop.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb188d667d---ruperow.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/48523878948.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b830de339d---18073086882.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/dilavikofunukazakoxex.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/16398318758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=convertitore+pdf+word+download+gratis+italiano+onlinePDF 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_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 18048 bytes
SHA-256: 52e993a612950b051dbdcca4dc064c7f857d2e068b9953be060c47b2cf8fb932
font_01_sfnt_off000135d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 10856 bytes
SHA-256: 236f532efe0b851178a30a5ff8ff0f097cb221d101eb3b85e8990e82cfb8a185
font_02_sfnt_off00014ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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