Malicious PDF — malware analysis report

Static analysis result for SHA-256 d419ba5c39ec8de9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 20:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b203643f6f33d16689eb853821cc6b47 SHA-1: 8574c5c2b5d817041332f77b0c03e80431a29a4c SHA-256: d419ba5c39ec8de916707b05b138e5bc6c7496c909eb22100fa589ad7878cfc9
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content. Notably, the document includes instructions to disable security software, a critical indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://tennis-samara.ru/img/file/rudiw.pdf In PDF document text
    • https://soosekszer.hu/upload/files/lomunomineru.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/fovupisoriwawerawob.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gabiwiletukapabovixoda.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/95513623862.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/21p2gom6plbktck1em8thgofp6/3633287578.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/masowipede.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/xeledisidu.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/bawixexevetulemudunalon.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c992e4913---68104160400.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/kulop.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2jlot11584gr7g6s0um2u6gplp/3609462618.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/63546344831.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403890dd1ed---49343584111.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/bufuxamupatuwag.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/14045030264.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/68954597925.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/giwejubakibozumolev.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/vixevotijoliwef.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/51145585230.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/xogiro.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/46877704643.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/71ec14abee38a7e7df8606f5ba2b48d0/jital.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f545ab9c7e89a65aae138e875b7bf67a/92375663842.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/sofav.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613be00a8b876---wugazoxuduzawatepewo.pdfIn PDF document text
    • http://klenderbio.com/upload/files/darinesik.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/88268558380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=notification+blocker+apkPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 18196 bytes
SHA-256: 4ee9475779282abb8cdac8e3ab46207fe527fc4cedc47bd7f40d157dcefce0e2
font_02_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 10516 bytes
SHA-256: f624b972ace00f20ebda26116d1de21f954d23c6123b95c2debaf08378a9e725

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