Malicious PDF — malware analysis report

Static analysis result for SHA-256 227643c6b15663c5…

MALICIOUS

PDF

94.8 KB Created: 2021-09-14 04:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 184578ee9015609511bdaf6535d98c44 SHA-1: 9df9627725da61de8c46f66468f4bfef69a8081b SHA-256: 227643c6b15663c571374ec6e48df187fd627b83669d7a50db2e675c9115b95e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ap9stotiqthtra9mie96dbi823/6349675001.pdf In PDF document text
    • http://uptownherndon.com/uploads/files/38951391850.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/novesogupasavelonepokimos.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/2387150536.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/mezozinuzizapibubazirawi.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/41715028582.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0561a31b4045409ae910097ea6018eb0/liron.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398440d1362---nezabixi.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/dufalafod.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/97743544108.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/josudukinabobasolixe.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/zawuranijewugi.pdfIn PDF document text
    • http://land89.com/ckupload/files/15261121459.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/gajix.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090106080573499.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/vomajurufufuladeruboxekav.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/80404093337.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/29546350860.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1252b267d---gumaliboxofupi.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/dopazinewiparimunemiluxa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/171332b741523628c3e5bea02324deda/vutodupirefi.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/66139437257.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/wutamewogavawatepolaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+movies+on+ipad+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 10712 bytes
SHA-256: b0c45bd51beaf9384f62519a16decb1c05946bbbc5afb5ac3e808b844ec2caa8
font_02_sfnt_off00013fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD5 17760 bytes
SHA-256: c58336cdd4999ab8efdc543b8c34c2d145f159f9372339d25ff2facbe62728d6

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