Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfc2a9e69a1f7a4…

MALICIOUS

PDF

92.3 KB Created: 2021-08-15 08:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec188cd6bb6171fd9687f04d6817fd84 SHA-1: c10831649f53e1a16df65148e1ffd1b5e6d8477a SHA-256: 2bfc2a9e69a1f7a458d79b817231835fb2c2503cc02ec42e085ef6856832e807
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://angkortaxiservice.com/userfiles/file/gusofara.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cqfu75htv8po9cf4vdjifkoaje/farujamutib.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f669b21ff---jetitu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/nexan.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/mapunewezixef.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/29897773977.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/17151657312.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bc45c87ffc5e3922fa5ff5949ff52b91/50853729658.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/12642880093.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b096cdc6a84---jijipewujadiwosarif.pdfIn PDF document text
    • https://digireg.ch/upload/sevijuvowokesisejadon.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f1870e40---gofepe.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adb99c17784---rujemasod.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/lakusolepu.pdfIn PDF document text
    • http://fpole.ru/sadm_files/37184091532.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zipalinugovij.pdfIn PDF document text
    • http://besteva.com/upload/files/15461581700.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b31a6304---legutevogikirutomurunok.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/80536842826.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38827c0c8---zejajevaj.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/87504711651.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/93724100582.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ed135d52c81f68710d8c25120253fe5c/60933881365.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f5aee5bd9e5---jelosakodosudujurovulov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=neurotransmisores+del+sistema+nervioso+simp%C3%A1tico+y+parasimp%C3%A1ticoPDF 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_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 17048 bytes
SHA-256: 29cbe3b4954c11e173d7df87d5f1b695850a8731c979c42067c8deefd87565f0
font_02_sfnt_off0001466b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466B 11112 bytes
SHA-256: 348598b85ab0db4da3a7d9163b0288ad3cdad0e105ef9d138e2e8693fde4b7c9

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