Malicious PDF — malware analysis report

Static analysis result for SHA-256 1446a57ceb614d66…

MALICIOUS

PDF

79.5 KB Created: 2021-06-26 19:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdad3f621a6f6afc67db1e7671a31f51 SHA-1: 94f7b2ad8e9f586714e7327392fa674f908156a1 SHA-256: 1446a57ceb614d6603dbc9d8cd2a1d3f8dae5c4594ca9c03c8c9d5d50b7964bf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the structure and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5985

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.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/7jugevkdgk1de8rlkog3a57lae/25947607032.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16092e81acb7c8---12368856253.pdf
    • http://palyavalaszto.hu/teszt/upload/file/rozaxipuvukijijefig.pdf
    • http://24cvety.ru/upload/files/lisakosokafetijetusutigu.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f2e53ee6ff1009ef66ddb2e09c723a44/91727133725.pdf
    • http://vienhung.com/webroot/img/files/76417828883.pdf
    • http://www.thaiboat.net/image/upload/File/25023361461.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6e010810---vodiwi.pdf
    • https://aucordechasse.fr/vosImages/58597280150.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dprtglavqg1st5ff97th1stea/32754089273.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608551eee5179---givowidujajejo.pdf
    • http://raylutickenterprises.com/userfiles/files/fijopoleloj.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e197841b6---99074957708.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fa78c171a7564caf70b90c20e37bf8ed/pisedoresikataw.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/71b2c448612d71f85c385acf0bdcafde/wolowux.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xukisin.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/i1lgrli4ql380skmrnu7e55jk6/batuvipawawegibumi.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7a0e3ac02aa6fd735a3bef8e68e4a450/gobab.pdf
    • http://carrasvilla.es/uploads/files/64037081352.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9639a9b6a---34906320868.pdf
    • https://unosms.us/userfiles/file/wutusi.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/645a76ee773ffccec4bdd580ce032af4/91883239237.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ankle+knee+and+hip+pain+after+running
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa6f.bin
5e1c85b0892c1fe9d623f27414b450d6bf5780e84c0ea823be3d6fa5ad67cd70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 17104 bytes
font_01_sfnt_off000126f4.bin
ea591f6ecbc1277b2f57328fc269f61b0acfb3894fc5d049cf2170de21213a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 10660 bytes

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