Malicious PDF — malware analysis report

Static analysis result for SHA-256 e954c354f0355bf8…

MALICIOUS

PDF

61.2 KB Created: 2021-05-20 01:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7202d7fc01e27c97bec6a6ef60cbf81 SHA-1: bc2b82b49410ebc1dddd0a39fcd12813cf01a636 SHA-256: e954c354f0355bf85765eac49d321e0e86f21ffe1d43c8aebeecc23968e2bb24
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9650

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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9376dc917---juneruvi.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ro4h2hr8ko0b2l60tvaa5ep23m/91963130043.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/up0h81nie38lu81i9tsmqir8eg/15235249864.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e31bf875d89ae99be50c57a284298a97/7662649541.pdf
    • http://szao-spb.ru/images/news/file/golebonuvumofaxuti.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085eccbda977---7589437403.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094638ed0941---vetavoluzikelet.pdf
    • https://atcotourismtravel.com/userfiles/file/46144663367.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/7bb3e1465329372952a52ec210bb2e96/73415970045.pdf
    • http://interwork.sk/userfiles/file/66534593126.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160925bb0cb8ee---kugunirasewigiwi.pdf
    • http://alliusie.com/userfiles/file/63476558156.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m1u3jtq0ce74gg3mkfr0ea8nbt/vibemozagibire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+error+code+sc+mean+on+a+samsung+washing+machine
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95f.bin
ea53b5ffe6be0de0c05aed4fab80d7bf4b16022e67d77a1b5724d79ca15f726f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 5424 bytes

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