Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce057d596792f93…

MALICIOUS

PDF

66.5 KB Created: 2021-08-13 23:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ebfd44f28cc55d101fb0334f188cabe SHA-1: 79ab20cdf9f73855992e7b6b6069233cdc096755 SHA-256: fce057d596792f937d9a047638203fb1ad4627d21ffa6c8f7e9cd28fc774d4c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to obscure the ultimate malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these chained links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9662

Heuristics 5

  • 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
  • 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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/76927a8955831fc795d444674141188b/mowomav.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/19819c8f3d86254d38a00ccc7ce63514/muzozugelifaribabaganu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8d5ea51ae---gajeponabijemigatafuzixe.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8a8c9ad003745062d8e5c0dc0984cf75/61098318595.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/5556229810.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/28109758165.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a041f0aba8f---62481337014.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/bawawiranekalebeduvex.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf4859e568---zubafexojek.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/76c9b7eea0349ca5db3578109077cd45/lawemojut.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6f298d8924fab2bf7fa2505b1c6673a0/59146307784.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50f8576ed---49388150863.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6324b68c---72094752286.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/db0074f32ba687ae945040a9f26303c7/dojadog.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/3628046241.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210717214917.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2204a55f9---susovediw.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95888c53ef---fopepefoxebupobameregamex.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/37497313748.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/efe71986a9f26c2b487bd40134840d90/jimakel.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/fefam.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210804032157_mmmsvf.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/55931256797.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/papunubejugibijolas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+questions+can+you+miss+on+the+dmv+renewal+written+testPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 11136 bytes
SHA-256: 0cb36cd7438de6fed0d75eef090b07447ffb135c412ac2cdfed525393575f006