Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d565c4f21d52000…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 11:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 02804b36297273fcf35ba720f773226c SHA-1: 2b26841d2c6094843e5cf1936ec6f0c75622fcd6 SHA-256: 1d565c4f21d52000d07397811a2fa9674c2514fb030df444461ee69ac6f3156e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=identity+milan+kundera+pdf PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ijcjiqis5beoj28i3ciuj11ca2/26322965179.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/megelisuvoxitek.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/56454535893.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_120243.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bonal.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/zunujuzalenepag.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/278e8aa8b0478ff5cfecc2148ea50ca9/sasisisedodosilupu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bfef33e6e---fedijidutomosefagojawok.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/25515394941.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/sejobopizoxoliru.pdfIn PDF document text
    • https://quote-supermarket.com/userfiles/file/leruwizufuzawakinin.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/32946563610.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/jefazejabaxil.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/musugopadulalaluneno.pdfIn PDF document text
    • https://mimpidia.com/contents/files/gibutolupe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c6qrcjecfi7ktfh312sgkmlc4o/73054792462.pdfIn PDF document text
    • http://fitviewer.biz/files/file/95202036894.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/22721339015.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nigujo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2f1f0e43bcc95525c7769487fce73cc1/pirokewegamixanir.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/31209274996.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/wiriwusajerosuvelifejup.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/ketezifulafelewo.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/zatajevawefenolonotejuj.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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 17536 bytes
SHA-256: 4f0d3df8b60c33e6f459b46b0344a6b9a4d751a49de218380064cb25a2ae1128
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 10628 bytes
SHA-256: aa530abf69436873b436c9c88c1fcb0821d46d4acf920977a7633f7bd5c1c732
font_02_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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