Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1799e00d51b7218…

MALICIOUS

PDF

73.4 KB Created: 2021-06-02 01:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a75dcbb9c4e2a69a82cfb510aa4db4 SHA-1: 233b9dbc9ddd5d3eef4f19e0233fbeb516d61a0c SHA-256: c1799e00d51b7218f3d13f43ac39e7191f4dd66e28ccd34cb7d09c67244ce958
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9782

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/18d3b51be4f8af1d1c9cf7f8a8dd96c3/92894887974.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e5068363---gupebilataturo.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c845d5561f0c08d0d7d01bb576ecf3f8/polug.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792f20e35bc---buvutifajofu.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b188d2812f2---xikamekisozekamula.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cbe0ad0a4---fubudataxawebu.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9e1816c4---10777566707.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0b719df269e51a24b329ba8407ecb928/38263884802.pdf
    • https://emilline.dk/ckfinder/userfiles/files/belarozemirunusube.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609055c974017---towaboxu.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/k1220b9g1tmkdkj1hns08t7jen/jelepowijugozajenelafur.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092e08aec4f9---jepopovegisekuwefonazovit.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/lurgbf0avbaqpn1grhh87nbnqi/medoji.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/abea9f92884f68f48d3321f88fc966ec/duxaz.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e746c35cd62e6c0fb9ff04aad74d8156/wizuvedukesumejiwiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=transitive+and+intransitive+phrasal+verbs+slideshare
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef31.bin
9158e7c96b7b91afdc5d90b83b41824c282b9e91826941de13108968c24a4332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 4876 bytes
font_01_sfnt_off0000ffa4.bin
6b3e1a46a9a9d94d0d04689fe3a60b9d12caf8a5859ffda352058c358c97e961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 12300 bytes

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