Malicious PDF — malware analysis report

Static analysis result for SHA-256 0defac4d728ea98f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 09:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32a8fb38d948b67fdcd39fe3493929f0 SHA-1: f0e6f524e0e02de7dd4e8a194f171816e1d2bf6f SHA-256: 0defac4d728ea98f1770dc4f13857de64a1198895ee7aef52ea49457a95b7f68
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of a PDF vulnerability to execute a payload or redirect the user to a malicious site. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://drafthe.ru/uplcv?utm_term=bruce+hansen+econometrics+solutions+pdf
    • http://dxline.eu/userfiles/file/26085654175.pdf
    • https://doublehair.center/upload/ckfinder/files/73712147155.pdf
    • https://bustotoronto.com/userfiles/file/76115087170.pdf
    • https://media-get.ru/userfiles/files/pifinaz.pdf
    • http://ibnuaffan.com/ckfinder/userfiles/files/82651434162.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/83ab1282d1f02a6f97dc099744cd66fb/58980264924.pdf
    • https://www.algeos.com/js/ckfinder/userfiles/files/16474659435.pdf
    • http://studiopignotti.it/userfiles/files/panemefabamorubigobo.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/87487868862.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb8abcd4b---pusepefuzaneveviwode.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba5f92ba9---fevug.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f52c0ef0d---91658166770.pdf
    • http://beiwendq.com/userfiles/file/fozenaxugekuxukosanikeri.pdf
    • http://lse.hu/userfiles/file/97311656654.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428cca8369b---xogimenapo.pdf
    • https://inverpalmas.com/aym_image/files/tozosabijetafixali.pdf
    • http://kxxbs.com/uploadfiles/file/a/19922001872.pdf
    • http://atdawnwelift.com/userfiles/file/jojusozudolexubepito.pdf
    • http://hortherbpublisher.com/files/upfiles/file/34662142998.pdf
    • https://godahoian.com/app/webroot/upload/files/73760125109.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/zemefonuji.pdf
    • http://humidorio.de/ckfinder/userfiles/files/wixuwix.pdf
    • https://dpt-mh.com/uploads/news/files/38214143262.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f93d330e8---25474614637.pdf
    • http://haithuanphat.com/uploads/files/mixexovatipixujiwo.pdf
    • http://www.moyekolodin.com/files/kasolexuw.pdf
    • https://asiquim.com/ckfinder/userfiles/files/76270243334.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e108.bin
0835ef43b2a5d4e9344151c80c70f1eab8dea1dc965ecfa6d2f7c28d2061932a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 18936 bytes
font_01_sfnt_off00011222.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16792 bytes
font_02_sfnt_off00012a39.bin
a2664bec54f3661bb20efcd0b95a3b986032c1bd1229e5baa7d090a5dd13f7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 11036 bytes

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