Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a03744a7d2294b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 12:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e167798a95350a8ff0016e9b2265414 SHA-1: 3c2567452fa87fd48078243e52c72e2101f05199 SHA-256: c1a03744a7d2294bff2af20fe19d525ceb8b78679fc1cb97cabf56f2b85c7d7e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vibangthuaphatlai.net/uploads/files/rapiwosanakavevakoxakof.pdf In PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/waxixofejezide.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sevoderubofimowupevedajuf.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613011bfb44ce---poles.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/digiwelududifola.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/32000162203.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/renorufidodulula.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b8f84871---67429072411.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/dijagarenedafado.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jonasorulesetonip.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2abcd36293077a2ee827b31cf4359efa/jezuzunudop.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/95237934871.pdfIn PDF document text
    • http://uteambio.com/upload/files/roxojemomasilodeg.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wixan.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/27832561738.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210906193521.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614957a5352c6---tawuleb.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/54692511560.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/69491088309.pdfIn PDF document text
    • http://erictex.com/ufiles/files/9646851775.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/zafawi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a46206714c---15873000274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=roblox+generator+for+freePDF 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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 10416 bytes
SHA-256: 76de0fc293c87954999b78435bea8387bf36ba051336acbdcea3332982fb323e
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 17996 bytes
SHA-256: ee936cb48f5e8cd4f8778092cc97979e71c542345ce33bb1eb74efc0a17f09ea
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1