Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b67c73677d478fc…

MALICIOUS

PDF

81.0 KB Created: 2021-08-15 10:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4270ee009fecfdc8ae616e68d2d13c1e SHA-1: ec1826d2743fdfdcb8d7e2f52cf7c40a1a4e62cb SHA-256: 1b67c73677d478fc1f2f3478a2ce2ed335688345eccef7b2a9758bec88bdb71d
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 or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=20+rational+exponents+and+radical+expressions+worksheet+answers PDF link annotation
    • https://beautyyaurient.com/editor_upload/file/texuwiputadetakizaf.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f72992f8751da6217170db5c36e4e0cd/gawadimukifokox.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/gogutiwawenixulixuzaluk.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/feda730f26090aa4c3ab53db7786ad20/fudipasikosa.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9756m20e78jg4smbdt26et4ta1/17405748190.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9a30f338146cfb99cdfd49586afac44a/73175658058.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/89404977325.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc11c63f03---zadexotasagagefupe.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/tokogufinuzumifotifuwone.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/tukoketebewomimesu.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/libuveborujokisebulag.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f95cec756f9---79628311020.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/xepiv.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tiliva.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/qe2iq5d3a6ddpush44b1adl3s0/54441508254.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3a20bdfc---44620748247.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/vonot.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/wuxajulogogopapegedimowi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4ce6930c---8962265832.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4c9c275e9734b862b06e88ab89aa7303/17868480511.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86348355937.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/riafa2mncnhnkpoparr1gc1dpq/ruwegiboleparijapej.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/emqpj97kg2g0gk4pd7a36k6ake/37884269176.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/26260656635.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/rawufiworebizolinir.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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 11036 bytes
SHA-256: 5ac1d018a2347aba44330d7f30f2efa796d45ffdbadff2cea0996251b05390fa
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16848 bytes
SHA-256: 7f005ee6e7ec1ea0d48bd00b98f6c721724139af19807805b2ba939f9e9fd16e
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1