Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2d4b65403b7c06…

MALICIOUS

PDF

95.6 KB Created: 2021-07-07 12:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e695fa137a5fff3706e405c4bf28b244 SHA-1: 3ff856194f31b1fc8f0c0586ba60b8365baf9218 SHA-256: 1d2d4b65403b7c0639b6d7235bf6573e6a679bab5f6f652c0525fddb19013432
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to PDFs hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928da4524ae---wutenapemelix.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86ea670bb---46204427256.pdfIn PDF document text
    • https://beliangka.com/contents//files/kugesatibogoju.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/ritenesugilepulajijulo.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/wanulidixig.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5919807ad29d72b1e7a3a3802ec21b62/pudifisobojukonokajapubom.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/32ko17nbsnis845i3d8etbadn3/57061417576.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5bf470d9c---vogabezidanupir.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/300030159283.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/649674bd5e695ef07780e9827e75e544/62660427413.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/tinowogafijejukijebazo.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210608_A2348D739D251355.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7en6gadi3vpg1m62bhvkjhen25/36460272953.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/derinaluvizej.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/55741721523.pdfIn PDF document text
    • http://www.toptehnik.si/images/55700332071.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/xexukegebaji.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/47dc5081e9c752ec7cd43e8516494a00/99628209369.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2131a9106616035b672f9d36e046f662/titewovumifavowolukidole.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0f16a8d517b588c9b0cb94b9237e9b98/tijomofolimol.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8ufe3o9ho5t9h2s9057apd5o44/6810829068.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/36656604503.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffedf2a37---77421800227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=excel+vba+automationPDF 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_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 10516 bytes
SHA-256: d5e8b4aa7689965857590c060c06c998ead16809610eec82aa0feb67cf6a6fce
font_01_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 23680 bytes
SHA-256: a7f85fc6ffbd2d54d5e53baf6267f93daacc210f94ec9b2a1749004af86e0d33