Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a60f3bcb1e618a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 04:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 531efa834178a71e3dc800ac0a537758 SHA-1: bab574ee547b730db759189b5e8efb8a978327ab SHA-256: f1a60f3bcb1e618ab5530655386afb74a9c68ca6ac27742532f5fbc9cf96fb05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=hobart+handler+210+mvp+mig+welder+manual PDF link annotation
    • http://barcabianca.eu/upload/file/94500796605.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/dovibawolo.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/18441354867.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/58dc5ee82c40a9a8c30e07eb074ab3fb/vukunivozudagex.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/pilozajusilavaxut.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/77361756347.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/liganizazotuboxatusin.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bofufujizunodapelekase.pdfIn PDF document text
    • http://novichiha.ru/pic/file/mubokirupobijunijesur.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f08f21f5---faninisuloritalevabapeb.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d65291db955e6094ef6fe47c3b507f6a/97132908972.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/wekutixetujosu.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/warufafemekivisinovitis.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/75419512722.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/99827192557.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3279340d---22022587327.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tajakajebapoxaxilamenev.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/tuxemupozes.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/bovegeduzojararozo.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/sanuduka.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/79263229311.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/51059608060.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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 11348 bytes
SHA-256: 6d75daf31186cc61922328b1a97851a73d61ab62d439a77430e9e3f43d019e12
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 18976 bytes
SHA-256: 0e1ae1707b01b52fd4f0dd4a287844cd6d9318fe25176946f2c463bebe291315
font_02_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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