Malicious PDF — malware analysis report

Static analysis result for SHA-256 959ec524eb76b557…

MALICIOUS

PDF

56.8 KB Created: 2021-05-11 03:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbabb45e79e7c474cf69f07b4f934104 SHA-1: 297bb75c4f7e56d5ffea3b1814cd100ba6633cab SHA-256: 959ec524eb76b557fc1973d38c3704b12c7add5231a54515b3b27f1a26b509ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9470

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://catamma.ru/uplcv?utm_term=guide+bloodstained+ritual+of+the+night
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/85c62ccebd142dafda821ee8e99bad32/40609723469.pdf
    • http://stroisvias.ru/userfiles/file/89306896660.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4fd436b06db0b92f043791cbd8718c96/88502711621.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5e559389---tiwifazivuxasafonogadi.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cbd1f071---59918585846.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/eafda708fcde5085c2bd295845d6828c/41195092221.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3b9d14cda0730267bac028843214998a/pusutexaforafo.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945a1c21b50---buzovupilemomorem.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/b5bea263684f605873fbae084f7a0350/11434821031.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/78db67f2d5c8b37a90de15f2220efed6/pakomijomesebavazefuwi.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f03a01606a---68185798200.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb1bcb848---balufafunogizevajamo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6g1pasea1e5k6v05c3nhftdtp7/bagolafemikowipelususipu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/480587abb35b8b70b7c343c581f5c162/karumu.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866b49ca59b---giwapojipakunozegus.pdf

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