Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d9a97559aea30c…

MALICIOUS

PDF

113.1 KB Created: 2021-07-19 02:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64716e627822199cda3fb24b6b58bdca SHA-1: db0935e0e6def65bba2d89804c47fdf099aaed9b SHA-256: 84d9a97559aea30cd20b2debbd73f235f394f503534027d3345fab5957ef7c30
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0ok50sgbd771kgf29seifd9967/pawimeroko.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l35ckqv5n0in8e4ubd14598p87/mavajanes.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/faxilirozorako.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vidijalaj.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d3a1fb10f43b3d0457dfb6670557a409/82731823693.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/11699086167.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/3646e4efc2a2641911effe7a42aa2220/57225380583.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085360fb7a75---zozuvadedabamuruko.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/rokibujemasoxuv.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7c1c4626dccaec4f91d93ffaa2b32f1b/16135531802.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/zonininepezeva.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/99326473831.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717550bf8f8---86639084266.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b7a659d7807c2038828fd2db6fd5227e/vetidifa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e875326e---10797003149.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e8292a64---mubaxedewerekeberojojug.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/81545409330.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/38152258424.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/72437113165.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/neul2hnrelhoqk6gd3ht68i4vq/juduvuputufakix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=use+of+intuition+in+decision+makingPDF 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_off00015508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1F 10872 bytes
SHA-256: ff922710955769230c29890623c9f6ddb4782f72623c1dced7d751fabcd71364
font_02_sfnt_off00018614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18614 18204 bytes
SHA-256: a657dac48b3248c03c74280d64aeae9ac6247302f71139a9581cf21d8f35d600

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