Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1f09af30fefce4…

MALICIOUS

PDF

87.5 KB Created: 2021-10-19 00:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e6be948982aefea64f67b1238c50526 SHA-1: c22957103ba3ee2e2c992b3f9220b3a8611634b8 SHA-256: 3b1f09af30fefce434648f2e7b60fc948850f0457be7ac30551ed0241e4148e8
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://apteka-wratislavia.pl/halatecza/userfiles/file/revomefizeto.pdf In PDF document text
    • http://artstudiodesign.it/userfiles/files/86448481717.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/18387399433.pdfIn PDF document text
    • https://maria-galland.ru/files/file/76152453315.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/kuxizi.pdfIn PDF document text
    • http://chinalabware.es/d/files/58321723665.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/s69n40bp5vrpjbqq0tq5cr27nc/xovoxukezovobilubuxasot.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1616de0cb625fa---78159984282.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/49745816905.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616061cb2a6c0---xafores.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/47923127817.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/lexoso.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/14265470369.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/24552259672.pdfIn PDF document text
    • https://kimcert.org/E/file/mevitotikabidudusurojag.pdfIn PDF document text
    • http://tokado.ua/media/file/bazawamesosuvawaberagod.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vawavumoxodidomow.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/89517526726.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/73042543683.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/ruxomosotuzuzigapu.pdfIn PDF document text
    • https://shibbirs.com/media/files/63832649226.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/84647451328.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/34598262033.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/95089813055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/vItLtdF7Pec/uplcv?utm_term=how+to+change+region+league+of+legends+wild+riftPDF 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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10932 bytes
SHA-256: e5fc84e1f11a7905db175d5287a94a0b415bc339fdfc4cc68fe7b34d1d8c52dc
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 18560 bytes
SHA-256: ce973c1a5e15aed069c6d6862dc14e21c651907261237924b00c6140d4948d3d