Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c677542f7ae33fa…

MALICIOUS

PDF

89.3 KB Created: 2021-07-30 09:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 965d538f810fe267b1e0afc2362268a5 SHA-1: 05befef52b7f8fe292d98fc28d75fdf95b5f6d16 SHA-256: 8c677542f7ae33fa94074b6a723e52cf06c9e8fe9e8b001739a259d5cfee8579
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9438c98636d2c8eda8a38de4e97e2382/73387410216.pdf In PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3b0a1d3fac17745fcf1f061c5ac7c9f1/58294437739.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bd14d052b03cef5ee19a99f09c6ba53a/52292024470.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd86928e02---wawet.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/37755638113.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/53418001398.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/65bc9fd4926745fe40eaa22b47e79812/lidifipudakulomexagotaja.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ghdq703h5mik5hcnunbj1gforu/4504696058.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/30756813155.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/putoredas.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/kegurumajatopelebixedi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c2f93aede---joxomefowomikekixo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f6a63f020d601613470135a391a282fc/12369876129.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/nuremugefanokerofuwojunu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tezenumuwumebadexobo.pdfIn PDF document text
    • https://schmitz.cz/res/file/90076134402.pdfIn PDF document text
    • https://autoskola-scp.com/files/63184768972.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54aa78d81---69487087023.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f0686361e29a86349720cd4bc9a790d9/lizosefipixux.pdfIn PDF document text
    • http://healthywithhart.com/res/file/xiwarelutokiwefu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9u1c4buu306ue4r1k5javc96a3/gekafevakogok.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210617_B7A247A219822B77.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7c21ae717---6881683912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=area+and+perimeter+of+irregular+shapes+worksheetPDF 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_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 11204 bytes
SHA-256: 68d699559547d2ae803a89b1064f3efc0bc827a13e065ec6c7dd7e4b0026272b
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 17956 bytes
SHA-256: 62f82504934e3cdfacc7d7f8cbd6b3e4ef01d6d80168e981df86bc233e22f345
font_02_sfnt_off00013e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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