Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f452a50b2e1dda…

MALICIOUS

PDF

84.7 KB Created: 2021-07-17 21:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da90d13054f9763575a4fabca01536eb SHA-1: 79a8d49cec09bec8f7d0eaac00e48dc1f8b06c87 SHA-256: c6f452a50b2e1ddad98170d511a13a6e097408261d4bbf0a135ae7942fc121e6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/efb259dc822df7eae260f6bd1d75e022/96136602953.pdf In PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/febuke.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c05aca74957---7172529316.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e1ac4a30a598623ee4f5955a293af1d6/59894800066.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/56962955115.pdfIn PDF document text
    • http://lucann.com/Upload/file/41829606854.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0d72bd96d2bad46718e0e27ee1dfbafa/jugixisuwosojaki.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/58933922255.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/30274441988.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd088541e---wezuwatadademu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772651d4dc1---rojajinutunupixisejiwo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160747c0d4743d---regevavorumiwusazal.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16249382137499.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c6003297a2eaa27654d82b3e8fe5beab/68642704058.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/67087649714.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a62f009e87---59965259619.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66caea306---66802580667.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/16s8jcuk8srr31ojvb9m35jrdq/retalumesomitakunatudeze.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/gozorimobenafafakizajo.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/mupuwegogifefi.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/moxawuwof.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/34134614427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=beaumont+rag+chordsPDF 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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 10832 bytes
SHA-256: a42be5e9cef30395919390e6a2e806156053dd3ccb7c6b919b5734ef325662d1
font_02_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 17460 bytes
SHA-256: df96b955064950aa28cf3ee796fbf3cbdfbd436c77eff03bba140f250598f111

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