Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8603382c6becccb…

MALICIOUS

PDF

82.1 KB Created: 2021-07-15 10:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1069ce7d1d61a3d8814634a88a12bae8 SHA-1: 144ab7e3ae3f353dd7d6396abf39668de9bc17d9 SHA-256: d8603382c6becccbe234e4f4062090cc494ee4e6942de2f947deefccbaa1f620
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised or disposable hosting domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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 http://www.multigacos.com/admin/uploaded/fck/file/xawunilumixalug.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/a22ce4r6g21c63n11r36aaqknq/99977301892.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/07894491a9cec8e0eff536f6f6e792e0/takirifavusinov.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/94095694683.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983636a2330---nomokuja.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/63636598286.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/33141498895.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gudinipomexeniz.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/gutilulapitamimab.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/13963321442.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/97388154675.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nedonajaxi.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/9114031055.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3461093deb---digigazoxudewekozijom.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/goxetipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=labor+thanksgiving+dayPDF 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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 17148 bytes
SHA-256: aa7a1a929c97e7d4f3e1b11fa4ac234c397e3345f499f3dfd6a2cba8ec95b77d
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 10716 bytes
SHA-256: b1659384367c6f1792e361bb0c245ea7731d806bf51a07e27d760d7199d1e667

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