Malicious PDF — malware analysis report

Static analysis result for SHA-256 403481223df3aec3…

MALICIOUS

PDF

41.2 KB Created: 2021-06-13 12:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7af5630e31c7837195f19ddbf15cd2ef SHA-1: fbb0323c26447d134b990e4cb0e5f28562837d8e SHA-256: 403481223df3aec39e0631bb71e10dc343b2fb0d753ef0fd5bf0013637b3f6b5
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious by 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 0.7790

Heuristics 5

  • 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 41 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://coretry.ru/uplcv?utm_term=train+like+a+bodybuilder+pdf PDF link annotation
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3584b161a---84812493755.pdfIn PDF document text
    • http://zatacorp.com/upload/files/monuke.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e8c83a8e---29955263258.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/44067456485.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1b06e8c4---dusizowuvedul.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/043b502e9f1843f5ec1aee0ee1ba209c/wisativeguwuzegap.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/64988023332.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/nafifijojedabivop.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/jipotidijebasiri.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7216_20210610225126.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adedf2a15ec---81999937513.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2f86166f55b03e27b3464de7e434719e/dozokelufuxorigadaj.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/xaper.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xejajevosozo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/f3f6o28oess9h7sikoss1li9l5/96495777519.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/694fbcd2f84fd29ec4dda7683a021646/56131349885.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/81250638964.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0187cc59f---zulaz.pdfIn PDF document text

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