Malicious PDF — malware analysis report

Static analysis result for SHA-256 3270616247600ab2…

MALICIOUS

PDF

83.2 KB Created: 2021-08-21 08:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92640af511a114d16ea062440a26229a SHA-1: c13a7843d255b2c7b4c579d2df2bc0f7c6bd2173 SHA-256: 3270616247600ab239ae84b1d6f5cb92eef5da38df9fa1bc3366295566e3d0c5
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to potentially compromised CMS upload directories, suggesting a link farm designed to redirect users. The document body is unreadable, but the heuristic firings indicate a malicious intent to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/16262238404.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4d7acf6880869c0e68592cb0940e13b/lezegexodukivep.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/wajelavirepujexajipirinaw.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/47446407484.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/70344036554.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/re7ohm0jecvq5f2p0pbm8p15c6/18930253565.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9b37e1175e0068b0e17dfaee33d792d0/revafixepupobebowax.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/34762332597.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rafabogojo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dceab4a43f0---wodinenovawopapaxifenol.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/zowabigo.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/40905547138.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623782072.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160750184dadae---xoforomomexu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ffb93fca04a313a2645596e8cf2db2eb/zojofanudufedatodaji.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcdaa9ffd8---woxuvaza.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7884418cd2ed221a07d86e7456a5c8b6/88591038674.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e767e49af2---tobipezijoj.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1149c4728cd89523ddacf59fa8956e24/60469481221.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/7340530246119232e93e19.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fad7224c---xatobewawanafup.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160873a75efac9---73579761259.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/gowudebimafezuwax.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/libubatajiwij.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemomajulezibifufofaligas.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/57719281139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=do+your+own+separation+agreementPDF 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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10848 bytes
SHA-256: 1f8782d3259d042bd1bce1c80ef9f1945f009638de272f52ec766b27348cf399
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 16316 bytes
SHA-256: 43038d48e0c74f9a1a6b719f00cc0f3af8be83c4f26eb9b692361f184b0fe2f7

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