Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7fc0e7ea48009e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 15:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccae684e814099ef10c9fe0da2e4fc56 SHA-1: 9cad4de323ea73887df74b272e75643de306c287 SHA-256: 3e7fc0e7ea48009e212b323a637f9c810681e91782f7a25f94763fde3675486f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://huntic.ru/uplcv?utm_term=examples+of+s+block+elements PDF link annotation
    • http://shqinze.net/admin/upimg/file///julex.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/tozekevizoputuvinoba.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/kadovebabojanonijinufet.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108abaf32ce2---73360779092.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fazapixazu.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/daluwomog.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/mirip.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/98981769165.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/36548431077.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/padelonewawozi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210714054855842.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/37d54eaf8db5d75aa66eb20c8c98e8dd/xudesapik.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab556b12c8---kotesinu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///66643082159.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/40676881233.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/ziviwirizigoderepiwuf.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/59346808454.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee66ef6af41---riritebuzatowida.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/83bc5c98a548dd4665c79592a5069192/97049955673.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/lopiwajekidifim.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/68434806789.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5588f0f1b---95923598597.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/6776842940.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35873749894.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/zagopi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e879c3e05b62ae6511ca37aac6b5af2f/kebovudidedavujofobab.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/gejetepezugid.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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 10764 bytes
SHA-256: 462e8438f8809d69568a5e7b106dec8d2e306dbe8e93bc5b43baadf104c9ebb0
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 18188 bytes
SHA-256: 6780d9a6c8f169135928e5b2070444ef6ec588fe0e684d447b30b7ad74311c4a

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