Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a77b552fa6ff4c…

MALICIOUS

PDF

117.6 KB Created: 2021-09-18 03:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53b0a509e6eda817b610ea3cf6574415 SHA-1: 79984d6cbd2c25eb68e7b3f9deafaf4b50be27e6 SHA-256: 64a77b552fa6ff4c0a320920cfeef6104b5b46237a35003b03d6e2fd47787095
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7853

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=how+to+change+orientation+of+pdf+file PDF link annotation
    • http://cariboohose.com/userfiles/file/zalilagogujexadodi.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/12858795004.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/34636014644.pdfIn PDF document text
    • http://marketingnews.fr/images/file/vomesenobivulukomanamok.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/binivuwurojoboxixita.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/20581838569.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/lujoduf.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/dezaxubibogobirabijoromeg.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/q98i3fmhurnh8d1lub62nbi228/rituzajazumolifojavujufi.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/95474575490.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/nifulafiw.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/30332017993.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/90621753430.pdfIn PDF document text
    • https://duvanco.be/docs/files/12310567480.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/1918317167.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/kejesubagezi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e715a08af---43461232558.pdfIn PDF document text
    • http://gazetavk.ru/img/file/nobakadifizebovokiwetiw.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/42255490299.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/60278585920.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/gudonapevesurogipugirumi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b4480cdaae40cb0105eacbc9c0fdff2a/lodanatizipezuzebesu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/20645235006.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/kavexejibisafinux.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/gajamojeloborovi.pdfIn PDF document text

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