Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b923b46cc09a233…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 14:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4c5a67be69351befdb4db3e0eed0179 SHA-1: ffc237babf3f53cb87f09fdae6e3d641cc80eed8 SHA-256: 9b923b46cc09a2339d724ef4e5190f4922491e888d788e1010ccae1fe16267b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://synerhu.ru/uplcv?utm_term=huawei+hisuite+android+smart+device+manager+free+download PDF link annotation
    • http://a-swiss.com/upload/userfiles/file/pivamixemosot.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pivowaw.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xijinebumefuralip.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/94437537660.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nonuzawunudesowifog.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/viwar.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/10188624313.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ruzigabusevugubo.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/buxuwawiwusalugekenazu.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/potifekazujiredemu.pdfIn PDF document text
    • https://phnews.ro/files/file/movefe.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/23469181141.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ced7772a09e9589e46493bdaeaf234d2/gudunadijokukofegerununi.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/gegezopora.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/firs89jv1gu5gdhgolei7pt1di/femujowazawujaxelorujavol.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/89089432179.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/498a86a78eeaecd8283b689361ef681b/55106180902.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/49778974179.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/49609722965.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xibat.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b672848728---63331541405.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitikitiwijexu.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/luzokewevuwupowitovetixa.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bilalajisab.pdfIn PDF document text
    • 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_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 11164 bytes
SHA-256: f12b38a5e49b7ee620b92a9b8933fef1c0693b15e2e770d909521b32d5c10df2
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 17552 bytes
SHA-256: dc35acc5edade387c190b6f3f2cb14f9745395bab518844e574dbfd89353ccc2
font_02_sfnt_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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