Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9098938bda60cf…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 01:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: add99648dd2a23fde408359f7cd0d514 SHA-1: 9c6db8e39b2ea21fa74493e103dd9688845c863d SHA-256: 4c9098938bda60cf691202d79ebe9a6880630368cbe61c47505a25845956ee94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=team+sonic+racing+apk+download+for+android PDF link annotation
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/27c7880a85a57c65951f52cf96417197/14525220420.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/nibelobukokepapo.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/zokokev.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/11762521382.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/nufivukibo.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/24285881647.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/ferorureloziferipuvege.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/54410463539.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/1910330692.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/55969018027.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cf517730331750755d652fac5893c7c7/xijolagojujisariwopu.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/42088312739.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144d2016ad53---87073093302.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/farujifogixarulu.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/rovevibexugetawujiluxako.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/ruwupogon.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/gatuf.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614038ae7efbb---xekexibezatebagunavin.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210915225427690954590.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/97773447797.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/87502337792.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_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 19156 bytes
SHA-256: 437e451b16dd2bd193d885b1fe8791185277036cdaa78f99b375196aa96353f0
font_02_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 11004 bytes
SHA-256: a8118e7ce5ddd6d6de36aaeb31b78327b7fbd97c3de6029c42a8b683a3b08bb5