Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57f0c956e198139…

MALICIOUS

PDF

44.2 KB Created: 2021-08-18 20:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 45dd8b4809c1484b202ec368f4a5bcac SHA-1: 4a733960702ba8c71f933a560b45b6784e35b8f9 SHA-256: c57f0c956e198139f1a86f1ff9468bf03c6c36dc2ce8511de8a6c52010427c96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

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://inwebjor.ru/uplcv?utm_term=naqaab+bengali+full+movie+2018+hd PDF link annotation
    • https://ohcsi.com/ckfinder/userfiles/files/83179073429.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb0429f39---susigepujeverorin.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/pamasibemerarumare.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772408b9a33---pakuzogovamamanidatakuv.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/79204895014.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/45704386012.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/boxazeratuguxezivanokabe.pdfIn PDF document text
    • https://avenue102.com/uploads/file/ganeja.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9894d14e440ef88c325b0ab782f20459/masufusulanexes.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/cd2b8b23087c48f28f6315717777f06f/52984551692.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0540af45---40116726215.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/fovofuwibu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631d193495---detanobom.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/kovijigebogegipakugo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6hd36ra1c82g0lqpor1kc6u7fd/92679785006.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/02120cc8a8104e5c463dc332603712a6/rogod.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/63661955d566cb13fe8b4c98a4801b20/xegIn PDF document text

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