Malicious PDF — malware analysis report

Static analysis result for SHA-256 645b2d833ebe3a97…

MALICIOUS

PDF

63.7 KB Created: 2021-08-12 17:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7105d33dbd9a5594ae1d1ec4a3b848f SHA-1: 9f6f3db19159162ea8cd6faaaa3336911cd37d3e SHA-256: 645b2d833ebe3a97542b164ce3772981fc0f9f87b89ab10a41f3640cd9009579
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7662

Heuristics 5

  • 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.
  • 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 http://fu-xin.tw/uploads//files/202108081659326935.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/39abe0cf6acf00ca4b21abe33b05b57b/nenulakox.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2bd733fb077f5ce9be2845cd8cfdada3/zifoponukinovumapasa.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/386fa69b3a165afbcb4875b04e702c13/kujafezetukivonivuv.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bfdc1c715---56834132494.pdfIn PDF document text
    • https://ayurmitra.com/files/file/77672923459.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/64216730383.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab1b35d015---wavewoximuragatubonabu.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/61792000742.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/mepukotisaji.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/tosidewak.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbb08b4bb---90339327566.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/logagijuxuluvurevakuna.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/35922611606.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb52f14ce---73252106750.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9901d27f7fbad61f9b4dfb730850affa/48058745981.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d462a5094b---gixavatopi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/724caeb12da7a57c8211273265dc778f/51421399290.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/67e515010b9d442a95f717a053a11cf5/38969134695.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082b95c95c11---43432304989.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/88476160051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=piping+and+instrumentation+diagram+guidelines+pdfPDF link annotation

Related samples 8

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