Malicious PDF — malware analysis report

Static analysis result for SHA-256 422caf8daf3a8a98…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 11:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87fdae26c0364bdf051a7d5060e09ada SHA-1: 32bec98623d8b1eaca956d80b7a2a54d90969683 SHA-256: 422caf8daf3a8a98e80863f68997aa81b1806b4ac579e36855d5ce80b1bbc66d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/19cd12db564863ab7350203f2989f1fe/wotorapanuxanazat.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/97ba9a4fbdabd680ac06af44e72f2ce1/56226267991.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0c247c8261a8072b6de49dfc4e9b803b/rexigo.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/jogalosasogeli.pdfIn PDF document text
    • http://alkanboya.com/files/file///lowugemosamokesodula.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/79087374531.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/36465959667.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/32815545423.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/69726043162.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/dujotanuvetopotok.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160727c5cef848---3562044667.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077fba0d9875---47223642504.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/18772781391.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210824132214.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161304d7d60ae9---3029730218.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4fd61697c---89523907174.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pewonojoz.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/biraxikujaluwuse.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55943d96a---totojevododisebik.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160deffe11f1bc---zimikuzofobunutizekovovux.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/oova7jg2cr05683ucqmvk4knia/92096595863.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/zepowidojasopezekebuvus.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/86824146381.pdfIn PDF document text
    • http://lianbang123.com/uploads//files/202108111335074642.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/703bba55aba254d69e916feb1121e355/54575331768.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/87812195735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dendrologia+w%C5%82odzimierz+seneta+pdfPDF 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_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 11060 bytes
SHA-256: e3e0ed7ff2237e253f9eaf1371d2f26e1dc8b9ef8916dd9af784abdceac1dd9e
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 17908 bytes
SHA-256: 69a146493b61446575caf668776ac3694b00fdd7a1e23a9c5fd16a75310f7d7a
font_02_sfnt_off00013fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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