Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0dbebf2ca8e910…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 04:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d3cfb7938ff53cb5a299ea339f423a4 SHA-1: c10965c445f7479f34bf468c0c6564600cd473b5 SHA-256: de0dbebf2ca8e910d6c259a236171fa8c777e896293b189bea347fd42fd99196
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 websites and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57de1a838f---mewutijujevunifoperekuna.pdf In PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/bemizuvaparodarakosuvav.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210619_A466C7459F502847.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/17769058113.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6abbd6630---71710510862.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9c8usb8ko9kuhp51sdoq70pgb1/dofewokovidixizexoru.pdfIn PDF document text
    • http://foodchemsino.com/d/files/64714017015.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/44894246757.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/39427197094.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/xozufazazizami.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/3896823461.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/94443725207.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/jejusufuvofuvajaled.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/31330565259.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/podejonolarivamumuvipud.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5j7n06arnn0dqmv38gvgn5iliu/limitimilovibawibexoted.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/16182877478.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100dec6e60eb---59507626844.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/marifarikesotubaxodaxovev.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfcf9887429f47f8c99ab066da29d10e/43107879242.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+a+circle+on+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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 17504 bytes
SHA-256: cd3dfe0afe01735a93f95e07c8251760a69f78416f84758eb4a59a3d23e49e32
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 10524 bytes
SHA-256: 549e9c68ce0f7c0c946e507c81d0b42e30ca52583486149864f6723cc81fdea2