Malicious PDF — malware analysis report

Static analysis result for SHA-256 a365e0d5d0dfa966…

MALICIOUS

PDF

99.3 KB Created: 2021-09-13 09:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6be7c217c1f05894122bdfa338b6faee SHA-1: 322c5c74487e16bc300a78b0a4d9f31575cdb471 SHA-256: a365e0d5d0dfa966daae5a82bcbb5d896167db46df092ac3a80f9bfd80607c83
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, potentially disposable hosts, often with UTM parameters, suggesting an attempt to manipulate search engine rankings or distribute malicious content through a link farm. The presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5678

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 https://smidgel.ru/uplcv?utm_term=aaad+app+download PDF link annotation
    • https://morabia.fi/images/file/5529561061.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/metilomolo.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/wopuwi.pdfIn PDF document text
    • http://masonhn.com/d/files/derusuwumofaposabe.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/86578995470.pdfIn PDF document text
    • https://electroagro.es/pub/files/39170772576.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/84738790296.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/lizef.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/kurigod.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/bigusavasogakuxaj.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/dowovukavidavibi.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/73073011222.pdfIn PDF document text
    • https://uangraja.com/contents/files/95193605859.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8bcd6e9ea---32867068630.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/luxidejotagofe.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/98093443995.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388057dfe54---31264370252.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8e089pcfoa4nn82g4inck35u13/pilumimuvekapa.pdfIn PDF document text
    • http://electric-kernbichler.at/12289354430.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/56631405179.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/ralonerozizadixizerid.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/43340248850.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/fidobugimetutu.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/tutekixamol.pdfIn PDF document text
    • https://rafautama.com/uploads/file/90053458998.pdfIn PDF document text

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