Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8923f9508c3358…

MALICIOUS

PDF

80.4 KB Created: 2021-08-30 11:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3308fa45e7c49759bd9259f4285a1231 SHA-1: a2d15ba8c5dd2c56982eced7371fd2271c8a7751 SHA-256: 6c8923f9508c33587745f853e3bfadd3f0265144216dcfe175b5ac658ea35cc9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded content is heavily obfuscated, preventing a detailed analysis of its specific actions, but the overall pattern indicates exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=which+vertebrates+are+cold+blooded PDF link annotation
    • http://sobsai.com/ckfinder/userfiles/files/jixog.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879bd915c7---27083884697.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae2e7ab7d9---73502997983.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/95298784650.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/92025356321.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/30809137988.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085235f8edb3---20823821552.pdfIn PDF document text
    • http://waypl.pl/upload/File/19515054311.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c1cffe107a27a54b3ca0fe19fea8ffb5/webatimomawamijijefu.pdfIn PDF document text
    • https://nistd.in/userfiles/file/22212832159.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/bamivowutaxaxofo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c742b6af---vewanolexene.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tag25na7djbhe085bpg5qunu90/42384666155.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/56466818728.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070828fc4448---kizapisufotome.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b8e926349d53469e2c9c6ee208ea4b09/69710507389.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/175e25fbff23dda735ce92ded22d9a8f/3758645715.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa0327c4c---roxagukumofafugajigirowud.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/98641374883.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc879542cdd---nemigu.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/24483616092.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dce70457---95528058928.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/losodonixajodixaguxa.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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 10564 bytes
SHA-256: 3a456f846f6959748b661f7a91428f4dcdd10865321e6e4a5d68258e620fe631
font_02_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 17108 bytes
SHA-256: 26e48186d4dc643d79bf9998360754652127aa583642693d49e12db362cb9e12

Open this report in the interactive analyzer, or submit your own file for analysis.