Malicious PDF — malware analysis report

Static analysis result for SHA-256 866319532a89dbf7…

MALICIOUS

PDF

90.7 KB Created: 2021-07-23 19:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21317c99fd0837c02c7c5fef2527a1e8 SHA-1: 351ded8eb8fa677d3b2d943fab7e77165c522ff7 SHA-256: 866319532a89dbf7e3558d6070e4cc96f9c51344746dd3e5c770edc602adfddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly suggest this PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0583c9f0ae---zelenikusedumalono.pdf In PDF document text
    • http://bydnjl.com/userfiles/files/95574263086.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94513196917.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c03734a082619c632c10f98818edb058/38849354934.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983877334f6---41905100007.pdfIn PDF document text
    • http://firegallery.ru/img/upload/84013240476.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/015a1ef94dd51735ef4ab626c755b072/tanubazojum.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6ed797265af2dfbb84500b7f304cd34e/89648219867.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ea217f1f---22549571883.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/tuxibejenobiwadan.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3cd13d60---51174368924.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756dd4787e9---tobivewerijonibiwanal.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4n8th31rntnjfueb5ga5u3a7c2/pupez.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210714052709.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160975a559548a---kalomefevujotux.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/47232564517.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b9822505---sakanikokivarinufi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/71389292704.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5870d099---6019868718.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf02447bc9e---49919004914.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wevipenivuzezukopesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=active+directory+infrastructure+self-study+training+kit+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_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 11184 bytes
SHA-256: 02005c4034a2aa25b733a738771e87f8ab8e6e51810d4237c45664269344a3eb
font_02_sfnt_off00012ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 16744 bytes
SHA-256: 1ca67e9b8cbc626717c82514e7caa78d970e970818b7406b6c695ae85296d1cd

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