Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff9adf9c956e23e…

MALICIOUS

PDF

90.3 KB Created: 2021-09-02 04:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62181fbde40fc79131c94d87a5c34803 SHA-1: 0e62125b1e4c34071e6b6c44853d5fc90bad4f8a SHA-256: eff9adf9c956e23e771f259166fa02344c1a5b9189567c42c447a9f116131554
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://genegurumiraclehealer.comuserfiles/file/96638106514.pdf In PDF document text
    • https://villatoscana-pi.it/userfiles/file/75357822447.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5e53b6e2---zebomosomibinanujupoxag.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/52942982867.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/47596181770.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2ab90e5c7188445ba415c474faf06205/24485483556.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/suzor.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078608949041---73813134156.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/31321104771.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5eedf3a---89966492719.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/xajozebivemefafoxa.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/50196617015.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/fipibegekewoxe.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/9111223313.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/237ebf3e26028af39d1a6cdb77363e92/mijadafavizekabu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160711f4cbcb30---52906094742.pdfIn PDF document text
    • http://hidramaco.com/files/files/20952353571.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/40d4f385ecc93ccb25e93ce0e69fa14e/86743599592.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0a2ea2af---vonejipugukibikugifoli.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/76988413745.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/16006578278.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16281244678213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reasons+for+scramble+and+partition+of+africa+pdfPDF 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_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 16988 bytes
SHA-256: 8c6d449d3e37456592a91e662f42acfc04002f5ea58a118f59dc3d459a5f9fe3
font_01_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001415f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415F 10968 bytes
SHA-256: 5dc2b5e9f6699b1e611794693b25c556adf5839144d48a53813d990d9f297d56

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