Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b3aee7a72f85a1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 11:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4f84c8ecda20a57a0a0c9132b16c0a0 SHA-1: a173244f0c3efd9f9340eca23460d6a46010a47d SHA-256: f2b3aee7a72f85a128b4cc56c423f109c87fd286940d65432e8c49c7395c0865
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other unknown hosts, suggesting it's used for phishing or malware distribution. The document body is heavily obfuscated, but the presence of external URIs and link farm heuristics indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/035fd6283b6b4394acfc3f0b0b0ccd98/pimufositidogome.pdf In PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/lc662mrrph7anoha6pic72lees/zoguliv.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/varavatabonoz.pdfIn PDF document text
    • http://artospace.com/pics/file/96795292239.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/wadewowutifefinolivip.pdfIn PDF document text
    • http://adveotec.com/img/file/37280193505.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107098653826---45153395535.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5ff382eb1f20ebcecc652936dad28ed3/bavijosibotusilot.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/maresokuvono.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160985fc5a2cb7---vivolo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c863224f360---33073968685.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0411110d7---50960945653.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/fanig.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/72720099388.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/hubffujb4ridiqbdkgbso8cicf/83096372188.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8013e3bdc---dubusupigunar.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lamasidur.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/rokizut.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210618191832.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aec715c83fc---waxizasivamefeja.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/7240134864.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af18578de7e---64400532662.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wuxabeguvorugofi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f107c8423de---bofoliwarajutejixonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=solution+to+water+pollution+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_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 10584 bytes
SHA-256: 78aee228a87270a7bff51898ba4f65d5e14b0c70f7af6e9769af3d8e0ead244a
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 17872 bytes
SHA-256: 092ee5b4966d9a79d781bfd4ef8811464900b921cdc8d57bbd8db5252971eaf8
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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