Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86ed122b81db7a4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 23:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ff8f826f12f17e5188e5ed483cfc48a SHA-1: 7d1b51ee43e04b4868d823d9e4a66eef0e4e1416 SHA-256: a86ed122b81db7a42a2ae80fbebfd8179e35a9d4ce0f7f67ccda068fb7ec02fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://auto4-spb.ru/public/images/ckfinder/files/nemopurat.pdf In PDF document text
    • https://primer-spb.ru/files/files/sopotogototalufusulit.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/nolawobexujefubadovuwozu.pdfIn PDF document text
    • http://boldogelet.hu/media/zuwafewedeneferubaku.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/zekazegenup.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/fisowagujivodagazexuti.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c19f144057273ceedb2bfeb747b91e5a/96568676427.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/72085355055.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zemisadasakatifewun.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/zosesexexukirarugo.pdfIn PDF document text
    • http://boki.hu/editor_up/lubezojidev.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/33608402163.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf8baf505---81365214840.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8372acb4d---podofuroje.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/susexefidurixupuku.pdfIn PDF document text
    • http://platcometals.com/images/file/pekelifofasanoreki.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/mefas.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/ronibugavos.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613793d87878f---47739417405.pdfIn PDF document text
    • http://zeci.nl/im/image/mibetagipezetonamelunogow.pdfIn PDF document text
    • https://kimcert.net/E/file/32649403407.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109191623443745.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/17781170700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rujuta+diwekar+pcod+book+downloadPDF 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_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 10932 bytes
SHA-256: 5ee6018a0ec5810e7ed4b384b181458654194c7a72c22a9c137b936e0ae8beea
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 18276 bytes
SHA-256: 5e3d8d7dddc8484fc7dedc2811cd1d8336cd604938c5c6a9a85a970dbb268e79
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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