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ThreatOther

Phishing page hosted on *.vercel.app subdomain disguised as PDF or document viewer

vercel-app-pdf-viewer-lure

What this tier means

High-confidence threat indicator — phishing, impersonation, BEC, or scam pattern. Strong contributor to the trash decision.

How Gorganizer detects this

Phishing page hosted on a *.vercel.app free-tier subdomain disguised as a PDF or document viewer. Vercel's free tier allows any user to deploy at <project>.vercel.app, sharing the vercel.app HTTPS certificate and CDN trust reputation. Attackers deploy a credential-harvesting form styled as an invoice / contract / document viewer at a subdomain (e.g. invoice-review-xyz.vercel.app) and send an email claiming there is a shared document awaiting review or signature. The signal fires when: (1) a link to *.vercel.app (not vercel.com) appears in the body AND (2) a document / PDF / invoice / contract viewing narrative is present AND (3) sender is NOT from vercel.com. Distinct from the CI-publisher trust family — this targets credential-harvesting-page-hosting abuse, not CI trust manipulation. Source: GC1 R12 council #2; Vercel abuse reports 2025-2026; APWG eCrime 2025; Proofpoint threat intelligence 2026.

False-positive guard

Every signal in Gorganizer feeds a multi-module score — never a sole verdict. This is a threat-tier signal — it adds a strong contribution to the trash score. The full pipeline still requires convergence across multiple modules + a margin over the safety floor before deletion happens, and Gmail's trash (30-day recovery) is always used — never permanent delete.

About the scoring engine

Gorganizer's scoring engine emits over 1,800 signals across six modules — headers, sender, subject, body, attachments, and structural metadata. Every email is scored by every module independently; the final verdict requires multiple modules to agree and the trash score to beat the safety floor by a margin.

Sacred safety guards — never delete starred emails, replies, calendar invites, receipts/invoices, or attachments — apply unconditionally regardless of any signal.

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