Malicious PDF — malware analysis report

Static analysis result for SHA-256 12158225c3bdb1df…

MALICIOUS

PDF

57.0 KB Created: 2021-05-01 07:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25fd47071af6626681474f01f9847b00 SHA-1: 011207f8b95de1cf402a1beb3e63379ee96469f5 SHA-256: 12158225c3bdb1dfcf36bcde4ee30d1034cdf762a739ec8058e5920fee73167b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The embedded URLs and the heuristic findings indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/51c5370707fb2f09bd785c9f7a04e725/rumuvonubo.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/492373d77f7b1a8175daa4a26d6441a9/61428621144.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6e56302---10377239875.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d78008d1a98d338d9948104c7f3f4ba6/33628676972.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8fa70d9f5---346623518.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fe4ec7624ff9e80976942044c7b400ed/20259093937.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607718f2994de---konotowipil.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085986a0b3bc---pajoguzasufaxaparuxu.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/r6bu258jvu7p7r84du7arok2pn/mokiwenuvixomifijif.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089d530a7c2d---suxaxemiti.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1f0d41e9---98945003580.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608873faa82e8---wedeziliboxifefofuxo.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6ca1cc78---98206104226.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ea49ab8cd3a5294e36f6146937ac7c88/vilerekujemawuxoluvaxukot.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160823cf02742a---kajaxalorewuvidabogux.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbebd3036---62440902461.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/18c641ad0fb7f8516b33b2d406da517c/9883285103.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f7fd8058fdb7026676ef310d38d5eed6/vawafavow.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/vijaxeboxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=acer+aspire+4750+bios

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