Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9d2b70ebff06dd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 16:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 136831f71b89b424719f260df7c43638 SHA-1: e2375d8adc25e0d873583ccf9ff31a1fb5245ad9 SHA-256: 9e9d2b70ebff06ddf7c3e9c21ed172dd8c4b25d4558555a66f1ea2c0e55cf076
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dtj81fp2acaa5qinp4c0h5ggde/43817151533.pdf In PDF document text
    • https://namratalakhotia.com/userfiles/files/71713894030.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/nozifiwuxuk.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357823c45b3---murijido.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/41297246503.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/jununamawurir.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/88771672640.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/femudu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lijagifogasakavipawana.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/towam.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/tifipenetapewilotabube.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/88e06dd7351929c9e2558bc5b5dbbac6/3117809572.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/vabaxoxosojejati.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/nojolikaba.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/fugazazijimonapuperef.pdfIn PDF document text
    • https://beaszemin.com/files/54832040479.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364d83e2634---39462780075.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ea0735ff---nopogupet.pdfIn PDF document text
    • http://chemsdano.com/upload/files/45160596475.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xosuwa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613515041096e---84733097108.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/rugekubemekoroguzizefi.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109061023574141.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfe0422ce---dizuwazudunapukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+moon+extreme+randomizer+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_off0000b97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97F 10580 bytes
SHA-256: 361ca1c41b83b569157ccbbc08cd14b51cde4b1516522812436c5461514152dd
font_01_sfnt_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 17052 bytes
SHA-256: f82360361eab9886c81f5c72bad455e73bab04d3d53eca0aade5350e0c823def
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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