Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cbf8366391a36a…

MALICIOUS

PDF

39.0 KB Created: 2021-09-15 13:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3dd9dcdfb7ef520d389479ace1a56365 SHA-1: 84e28240609626122e3e8d0e9eba6ce6e0bd2b0d SHA-256: e9cbf8366391a36a01b92c0781fbbde36f10502fb3a5c17815209a49de63013c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking a link. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a campaign to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8684

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 38 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://reha.bg/content/upload/file/xogikedemumexat.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141126c1a5cb---wiruxirefobepikox.pdfIn PDF document text
    • http://naviway.su/upload/files/bibazoluwebixan.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/kijalozuduban.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dceh7dgf5id1j58199bcmgak9q/28421320709.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/lejukivefadozabotofu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/16d10f88b2d89164edb013374c43d2ca/89693815464.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/libupakedosigewudota.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/fizizulanofuwajedut.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/4124063720.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5c29ec84---bolapopoxefaziw.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c9829c3c2---pafemusujekaxeken.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/kitubulapujarofaxebudojo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7831e68a52514a20c9237bc3b92d0744/busakiwokapix.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/tinifolavokivamaga.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/mipinogujelenez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=device+unlock+apkPDF link annotation

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