Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcac609ebc00bff4…

MALICIOUS

PDF

56.8 KB Created: 2021-09-02 05:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6e13afa9d28e6cd5359a30e1848d7a4 SHA-1: 95968e2a5e66fef2f7198e2f26f8146fcdedae50 SHA-256: bcac609ebc00bff4ae30e82e71bc8087d4dec3330a91361f0239e56049c0b96b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage SEO and compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9568

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16110debd8fe4e---81333719614.pdf In PDF document text
    • http://biolabsrl.org/userfiles/files/36706615843.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/72844846898.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/66bf84ac4784c8d05d1ce28d10dbc0b6/96533810455.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f1d62975---50017638125.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/tomovozujulutivuno.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/85856187698.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a202d5989---56330664400.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/luxuritosivezubenowepujax.pdfIn PDF document text
    • https://proxus.nl/file/dedisosax.pdfIn PDF document text
    • https://flyags.com/editorResources/file///vukagajidajefajifufedupa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ptkikeptj1tuos1q62ho341it1/jizor.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/makoxavozoviduvinoke.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/ninabogiv.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210721141706_9g1eni.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nunawunilifurumab.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/21uhdakuk1g9hl99361gpcka80/19307899873.pdfIn PDF document text
    • http://poliinc.com/upload/files/84398081184.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/zuvovuparizo.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/41622646844.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108170757358889.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/19c742beaba8020d671e2a66abb902f5/49399176732.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090958cdcf20---midamejepamajopelekegidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=write+down+the+chemical+equation+of+photosynthesis+in+plantsPDF link annotation

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