Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccfddea2fcfb246…

MALICIOUS

PDF

40.6 KB Created: 2021-06-10 09:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ecfa0fdd3302852f93d3cb0c50a9c491 SHA-1: e417ee5864dd8353db189572bfb81d26e126a23b SHA-256: 5ccfddea2fcfb246bf6bde2c0ff4774a0dd760c53635d237bff91390472202b1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8971

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://wastran.ru/uplcv?utm_term=ielts+listening+general+practice+test+2020 PDF link annotation
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fc6aa3d01ebaf9fd5c3e251dd586121b/xewifidu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ffdd03ca---64396496639.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/zisujajawajositago.pdfIn PDF document text
    • http://nature-revive.org/files/file/darubuvamasinopedibatos.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d29f4d9bfedda8ed6f219f71cf16ee29/gigafuwupepuvako.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b8678234---xozatovuwe.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15e2479ca---47120930515.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/55e8d42e0d8662e2aca01ce533b38057/1559390689.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74969b6b6---tibisofilavun.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/dufujuwadotal.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7bb74993a90b4acded3d39c0ddce8424/vefubepuwuvererowesumoxuj.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/85pcirsjr21t71rqv7rvm4h2eu/sefurokisugu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0f978554e2a211aeba001facfd92aac9/seveta.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3nh4brvblo9mjhb491ushldrr6/65873416666.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2abfd6fc29efc5da24a21ba8fceaf9f9/2299100454.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/21183841127.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b3a1723c8ef496349a2f32b3024af6fd/95871275716.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/36888540307.pdfIn PDF document text

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