Malicious PDF — malware analysis report

Static analysis result for SHA-256 221b82b85709be50…

MALICIOUS

PDF

45.8 KB Created: 2021-09-05 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12924184bf63a0605c2e723459c92eea SHA-1: 61d4650dd3a0ca11a1a91e95b112ea83ab1d66b7 SHA-256: 221b82b85709be50b9c11607562d06524a51255da6ac514b9a9e002bc308ac4f
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF documents hosted on various websites, some of which are identified as potentially compromised CMS upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6921

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608057646ed93---rumebitipevotaganiw.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b068839c9e34fcc31a2cf65179af5d00/58903452486.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zuzufekiminep.pdf
    • https://stratasphere.online/userfiles/file/97942495273.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/22872360886.pdf
    • http://dashoernerboot.de/userfiles/zetudafojemoxujup.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cdl7hjm7uln1tn0ggemq4s5eq3/migesukigitidilivij.pdf
    • http://chupanhnoithat.vn/upload/files/65535659421.pdf
    • http://fitviewer.de/files/file/96105451179.pdf
    • https://smg.bid/ckfinder_userfiles/files/62740664632.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f07bfed2fb9---43321707350.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ferguson+1967+mathematical+statistics+pdf

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