Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c357c4d5a8f721e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 21:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebffa6e214b057c00201b41500e4fb8e SHA-1: 0d6a581dedd57baf6fce476a36a28d2e1f523178 SHA-256: 5c357c4d5a8f721e5947c9eefa920c4b03e928401773541ddf28327d16345e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=rondo+alla+turca+beethoven+pdf PDF link annotation
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/diniminof.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/xuxuregukini.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/g571cfc322mu66krp0088p5ul0/bosojezununak.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mb2eci59fe9hjt8b29b3af6dpu/bokalotipemepuwe.pdfIn PDF document text
    • http://metapolar.hu/tmp/tutidex.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4266dfe3e---jitorefeso.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210717173428.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb8d4274d4---tesafiled.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/roragefavukepefoseriw.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/fosezaxitexanibobubo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e9efc5dd2---mafepifiredekojit.pdfIn PDF document text
    • https://edbcagliari.it/file/39440815372.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/aaca30a0aa7251e66f2fbed0163531ed/nozamixe.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wanuwijabate.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/senujoturoratidawojinox.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3d409297---loviwirezuwajezox.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/jinirapenasebazojiwepi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/julejotazumibizabakazumok.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606de2635da5e---19745241536.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7525c1e831---gidufexulowufere.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/66252067923.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/xixofawupibe.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/jolodiruxujekakomenu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c781b4814b9---50053254627.pdfIn PDF document text
    • 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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 18276 bytes
SHA-256: 62d8417eb51a727f51f5a6cf1ea1cf58d0a1dcd1f63ad8fffb0423f42418865f
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 10808 bytes
SHA-256: 75d2ba5f0add292fbe739116854e48ca945321b1869e50d481a804146764d95b
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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