Malicious PDF — malware analysis report

Static analysis result for SHA-256 de031757cbfdbb84…

MALICIOUS

PDF

109.6 KB Created: 2021-09-08 06:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 105f52d1e2a958f613d62621ee8124da SHA-1: ed78caafe1430a439e8045a444956d28c8f7a841 SHA-256: de031757cbfdbb84220905d2992ba695ab528e89de46f12e6666647df109086d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, directing users to various compromised websites. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of external URI links and compromised CMS upload links suggests an attempt to exploit user trust or leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7511

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 https://catamma.ru/uplcv?utm_term=tec+traumatismo+enc%C3%A9falo+craneano+pdf PDF link annotation
    • http://www.macrolepidoptera.hu/userfiles/files/7686361303.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd3a74ec9---zadevukanukalevagufomolu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u5788ec6slecf1ur4oa7j0kskk/96133446030.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b3404cd8a13493ec4530db942692bdce/31710368885.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/64782176527.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/banipegaziwisunufenutofab.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/05fb7fd7c006fb50e726df5dd09d4f26/25671907360.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8bfcdbc920ab81499adb525d8848effc/63460056884.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec17dbd1ff---14331518842.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nabeleregesow.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/roverujadukafox.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf6d253c5---duroxeb.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/72183287857.pdfIn PDF document text
    • https://best-label.com/upload/files/59022682873.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/60530952575.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/69000174546.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/c7elbdjklc4cg5m00e5a0hk9mi/89067015420.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/162g64t02u8g0kl9o571i72914/94639405648.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/filuxavazajiriborulagi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608b07d4ab15b---gulosenejawotefa.pdfIn PDF document text
    • http://fittbike.hu/files/file/jilomokaxaferareruzux.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/r4cu2t9qd3qokth8i3g1nje330/ratekisorimutebox.pdfIn PDF document text

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