Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dabd3824a51ac3…

MALICIOUS

PDF

68.4 KB Created: 2021-08-03 21:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5e158289c70e1e5bc005886fb3b9141 SHA-1: 3f60513b7fb47b38d0149e4cbad13249e9bee461 SHA-256: 39dabd3824a51ac3c69b093b8bcaf818ddb5d36f7e59a983ec73d7fea5eea3fa
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9547

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a0a8ef6a---71080895869.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b250befca815230b267d1ffe28ab7760/luginetemomeraxifowosow.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/konaz.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b58f07060---tuxukojogisezirodomej.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vn0ea0g01iumk8jvr7paov2usg/29836804350.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/wixawuruzevalepol.pdf
    • http://makesomenoise.hu/upload/file/35334010625.pdf
    • https://khambenhxahoi115.com/images/files/60161975349.pdf
    • http://irollee.com/userfiles/file/dukarozeturotafobuzu.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a9eedebe---71928432784.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba4b5e369---jakuliwanoneneziniwomux.pdf
    • http://aftckwt.com/uploads/file/40105188524.pdf
    • http://robalton.es/Albums/images/file///tavujuwudodulimif.pdf
    • http://noithatmfc.com/media/ftp/file/bufupe.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/51n9805krjh3sb9gj3f6bcrdrj/36102984546.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/xarixodopozapuwewe.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e92481a273e21ae8a9e6abe29c7a18da/zulesosutod.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/2vvqiom03lin45k6ivbpg10rp0/99552897.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086244b70ee8---87570959454.pdf
    • https://machnik.net/ckfinder/userfiles/files/86309823744.pdf
    • http://hoaisonland.vn/upload/files/nazux.pdf
    • http://steinemann-ag.ru/mebubew.pdf
    • http://andrelandberg.com/userfiles/file/kejidelun.pdf
    • http://954move.com/clients/4890/File/vusorulefatubamanevijusiv.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9cee96e1e8---40426431247.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=financial+accounting+tools+for+business+decision+making+8th+edition

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