Malicious PDF — malware analysis report

Static analysis result for SHA-256 5509818346bf9590…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 23:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9aa258fb1c0b65bb9dac2a5a029e10b SHA-1: 6f3a8ff8654eb6930904148bea99ef3bb1137eea SHA-256: 5509818346bf9590c8d7c5a645764fc4fe3ec716f66ec9e1094222b3e58a274f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URLs suggest a malicious link farm.

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 http://sanzmendia.com/userfiles/files/bitof.pdf In PDF document text
    • http://greenplanetnepal.com/userfiles/file/dakizotevevexefuw.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/mepurogupegaremalaxebu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/omeqodcuhedfdcvlq7qtc3bii0/polunumezobenida.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be705bf4c5---59019375182.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/67910273765.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/61afu56ukfq3kcarecmca7ku46/narudo.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/62361172218.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/raxofokubawet.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/kadejiwanenajoseworan.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vororanuker.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/95830505797.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/2ce6329a98af473c8217e6f66c880993/24473550341.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/xugunawijir.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sutetofu.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/vaxotobewolek.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c523ffecf78---87175931883.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa7b8e1a6---bafemezisolawo.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/43219857322.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/16053423593.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/puridatoradowusa.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/2cdvvq9uopvssj16kuihtnu2e8/sesixaluxaninozomunore.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4609276511dca80998feee55552e28fd/16265760647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cool+stuff+to+draw+for+kidsPDF 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_off0000c302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC302 10420 bytes
SHA-256: 06d9ac1fa9dfba0d19ff33a06b5377152d72a8205b26861c9ae14a7db7d87ee6
font_01_sfnt_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 17212 bytes
SHA-256: 4b6c12b453e1ec0684d6cf3cbbe9d9b1cba9cea9e0b5fd080558199ed8d6a5ed
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.