Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1cd361edb84694…

MALICIOUS

PDF

80.2 KB Created: 2021-07-07 20:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 213d34bf4fbd90287d0237100fd7611b SHA-1: 21a89934b486af66b0943d463811a02273c3feb0 SHA-256: 1a1cd361edb84694c380126848cb1c93240113c7acca745d566736b8872acbb0
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs. The heuristics indicate that these URIs are part of a link farm hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=fire+force+episode+17
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/249c3a4ab05877424510687f15477403/wuxawajakasid.pdf
    • http://www.knickmeier.net/images/pageimg/file/11576197166.pdf
    • http://sk-uralstroy.ru/uploads/files/67390463565.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f8ad0a61---kimijutusiwozelibeb.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/p8vlrka6n8kratmlpimltsk5f2/10102021343.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2fc526ab---20410170127.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6nuts7pihq0tr5h6gt7j67rpt4/juwuxewufolupowip.pdf
    • https://theurbanthinktank.com/files/30233191292.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a220b17ae9---84828218375.pdf
    • http://pelesiuvalymas.lt/i/File/wisiletedelimixutez.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/86ada9507233b25fcfb61c862759658a/64787861286.pdf
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/xilinusejaxaxus.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16210772031606.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82f8436b3---dilodesatipovirogegazu.pdf
    • https://aradovan.com/userfiles/file/7362273773.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe877d113a---welow.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609484f9ad9ea---donirakexosimevovu.pdf
    • https://carlojans.com/cms/file/silikuxorolonofefanoso.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607840101751c---2481135032.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/ropinox.pdf
    • http://ledins.lv/cms/file/35969319157.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c0b79268---56563113189.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0099058e---padaganigesexutotuwejazev.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c483daa38c---94828445336.pdf
    • http://adveotec.com/img/file/xozikemuzuzevifut.pdf
    • 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_off00010a4b.bin
c4356e7db824c50fea587f4cedf20385800ad78998b8d452a163ee72fe52fad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 10284 bytes
font_01_sfnt_off00012198.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 16792 bytes

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