Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1daee11e9967582…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 10:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b68e12257fc7291588525a76ed276264 SHA-1: 74f7f2684d50efaf486f82a8f0784f66d0a050a9 SHA-256: a1daee11e99675828a6205256e1069e997a2190a392ab9e560b9554b5fd61d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/vomuganudenasejemivovovuj.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/dd52cafbb769254aa7099ebfcd0acf4f/vuwigirag.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/9448451062.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/85905502439.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/zapalofegukinepema.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ba51d04883cfda8bc8b6cbafe8c76a1a/59271610616.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4ac278659715b88aeff1118b8bdab9d6/31793795865.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/27866345331.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083aac0e2388---gagopur.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc66c6101d---xigezorowamapatutifa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e3da17ab66975b508a48c728b6c884a/nilufaselosewoguda.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/4132854289.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/6d5c54469d1614c5231d2d977ec8e17b/xabuvilowovijaranakoza.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/20705712683.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210804212845.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/21944780290.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b663739394---zamerowexutipunexewinam.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1728e6e957b2fa08fc25541c6b399856/40484284251.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c813f73397---notexedanefolapekif.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/xowiwavupezutadimonu.pdfIn PDF document text
    • http://adveotec.com/img/file/dakajigazenenagozot.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/31948976437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=telecharger+pdf+openclassroom+gratuitPDF 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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 11132 bytes
SHA-256: 9a5b89b21c96a70e20cfc8c0f1033944e691d79d191bd8b6871ad42256cadc56
font_02_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 19656 bytes
SHA-256: a5b72f2d2581b999061e3418c5fdfefd81d2bd6cf0a5930de94e5851674e6f2b

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