Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e4191bc41baddc…

MALICIOUS

PDF

58.6 KB Created: 2021-05-26 07:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91ed0b2c6188f20047fc6b233cb014a0 SHA-1: 1ebedc52349e5ab091c511a9a243436c6856d0a7 SHA-256: 19e4191bc41baddc13c5e6e676e546cfe6e44914018e7c2d50aba0b0ea6a584c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, 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. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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://baxsporthorses.nl/userfiles/file/ledizotunazesokiwimavogog.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4951beaa3---88289907741.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7f37dfd8---fenoz.pdf
    • https://pet-fashion.ro/mm/file/31021984532.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a61d94b396950c7d4883c05eb11f358e/pelebixovorekorap.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/66lcjao5tlpt3cul3j54qeo50n/nonuniluxuwofapewi.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2624bdaaa34239ec79a2668c1fd14ac5/75294384527.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160976025d6025---jajowadagik.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iu0317l730vb470nmlb2pfk4a7/gaxil.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5420ed7d---45892699011.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2r98o50ltit5dt9869pevsolgl/42943678128.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071533544857---87381432048.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13bd71054---24029205221.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a4rthd0plj6vmtjiadpdcpuqn5/ranekaxufunigofemafe.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2bb0465d7---26092978912.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867e9837663---bonosuvovaxipoxolepika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=composite+materials+design
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a9.bin
989eed91ce6fc85c1a40b4532333529426422606b217c792aceb8d81c933da14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 5184 bytes

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