Malicious PDF — malware analysis report

Static analysis result for SHA-256 9634a141ee581437…

MALICIOUS

PDF

80.9 KB Created: 2021-06-26 03:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b33c92ad0062b1e42ade573e56fc414e SHA-1: 241d0c1f71e0b26e158f999697db05ffca4fc3a9 SHA-256: 9634a141ee581437b9b1b7bd8063fa448587884fa341da4efe0f30e20589487d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/10c154e762fba1c54e430adcff0a153d/faferigozumiwekinotikadu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3ihv7qdc5nnm21khjd5g32hrl7/26008890021.pdf
    • http://superlitefan.com/uploads/files/rodobateweputab.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/upr2olmj3c67hcd0u161tco5so/58497120710.pdf
    • http://frangarcia.eu/upload/file/bizizuzixirupe.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7b913dc990928fab1bc8be275f95aed7/77507845472.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac112e9a1e0---vojapuz.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ad2fe69d791f94f15779693a0a3f1fa0/midadazalawojutenidej.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d213d505bf6---supogerijudusolija.pdf
    • https://iqmuseum.mn/uploads/files/83827490260.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608467a5ae206---23976498780.pdf
    • http://syarmarka.ru/userfiles/files/zalefurakepowanadosuwa.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9a3bef1cc61054bd108432167b8d52da/likexikol.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/57e3276f763b0fc98f52cc0b3e1c1500/860631457.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/48156161374.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b75d521f---6561269289.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad979d9f19f---99200872041.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/fixibemefozutefuva.pdf
    • https://motelandratecuci.ro/userfiles/file/mozuxawogimizerifoteb.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb88881256---genonagur.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ff4d67afe8cd881ab910f0ab11c8cf4a/50403747766.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2c0671310fb316bdcbc8df72eb5ca19c/posofefeguvarafelow.pdf
    • https://debcopharma.com/userfiles/file/65349878106.pdf
    • http://abpaluso.com/upload/file/sulofuvelo.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093bde013f99---vezabatidegugaxoxusovet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=write+the+simplest+polynomial+function+with+the+given+zeros
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7d1ee9954e098d2d8e323e5e8fddc568/lejadezi.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_off0000d2e6.bin
879af71eaae6dd471dec3c951319d981bb3acc5156fe757002fbe90a70f51ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 11344 bytes
font_01_sfnt_off0000ed8d.bin
61b03e55d930f57e9f455259288085e654d6fc4c79421847caf0db5357b447ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 18124 bytes
font_02_sfnt_off00011d89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16792 bytes

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