Malicious PDF — malware analysis report

Static analysis result for SHA-256 343fc663be4f49f5…

MALICIOUS

PDF

62.5 KB Created: 2021-09-02 20:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87728ed712eff186977a6f3fe789c5d2 SHA-1: 2d4b5d19dd1da611a46ee1959517cd628ed6e3dd SHA-256: 343fc663be4f49f565121727596746f37f8a8ba5e26b5dbae47d10af4fd5451e
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination or to host further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5895

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://xn--o79av69abka850ab6c.com/upload/file/202108140547144778.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ac54064d37b9807af0415a2770278a6e/jixap.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b578873f71---6027767115.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/74481161843.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/wixabi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5c5f5d36011f008b64a589b0bb2d1e8a/faretiwaro.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aced5f453ed---85172644268.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fc8b8c1288---zaxawewojeta.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/38423496960.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/nerotujojamaruvepaz.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/g5jmi5rmi42p5p33m4i54j7v4v/23335559868.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d3af49fb8d8561b84947e21eecd2c7b3/wipoxupig.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7fa4cf69---44712106144.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/kemegiwabijofugoz.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/52064471532.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/pagunarodemelinipoxalo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab750e09fdd---jifadup.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160894472dac45---lejitewavenit.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/3432667340.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pevataduvaw.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/309082617.pdfIn PDF document text
    • https://bloomeng.com/uploads/72017892183.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/faxiduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=linux+gs+merge+pdfPDF link annotation

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