Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c096712fb878d7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 07:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b80b2703b7aee0ab75efd2093c203359 SHA-1: f6b02db970643622529f6602cf8d2f4d8ff715a6 SHA-256: d8c096712fb878d726f4c581f0d94b0c49604cf350aa64c98dc593ec85986715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=bhagwat+gita+in+english+pdf', are used to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=bhagwat+gita+in+english+pdf PDF link annotation
    • http://ettermanenterprises.com/ckfinder/userfiles/files/32286842432.pdfIn PDF document text
    • http://envigest.cz/upload/file/kozuwazurisupelubim.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dea747d9e1---zuxafewegowawipusifujeb.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/darumipegadavelosajoxez.pdfIn PDF document text
    • http://sivam.pl/files/file/zamuvubazububu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b46aa0b72---45387905969.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/33879968894.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/divifosetewena.pdfIn PDF document text
    • http://tencanpowder.com/d/files/vajepesubarizil.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/pebisefimed.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090500553978.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109041043301059.pdfIn PDF document text
    • https://ubranni.com/uploader/files/23744534367.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/65487688775.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tixidutivudipovutoziwatil.pdfIn PDF document text
    • http://ministerium.pt/files/65589305100.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/32755930870.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/kazubow.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/zinivadexemu.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/81654627238.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/65080406581.pdfIn PDF document text
    • https://angkalaris.com/contents/files/gukuwolozonerijiralubibu.pdfIn PDF document text
    • https://wmu24.ru/media/file/43242218424.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/ximisa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161413f2fe11f6---55122949951.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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 19512 bytes
SHA-256: 77838631a8f968fc8b7fd3f270ebd6c9d3723b260afb324e7daa06b25b64c080
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 10696 bytes
SHA-256: 84799ffbf894fca0d4456a6e72712e3641df9536334caff08b22e8c62a504981

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