Malicious PDF — malware analysis report

Static analysis result for SHA-256 504a2ff40bffe02c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 07:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec4a85b6bad17c98960e1eda56bfb5c3 SHA-1: 067f429535506199102478fc281524ec58bdd0a6 SHA-256: 504a2ff40bffe02cf76e8882417f1cf5f96cd728cb8e3fb288b9426c79765ff5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS uploads. The primary function appears to be redirecting users through these links, likely to deliver a secondary payload or facilitate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ab8257a2d80b3c4ced36718067d1a2c8/55362388804.pdf In PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/nuwuwofimosaxusodej.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d50c37e4e7---dogufepituwufonokekuvu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/basiwusefujes.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/78203762187.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/mugasanoku.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/gujixolil.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/96271410581.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc699202264---wikumesubukex.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e1456cce---79431688681.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/79692578489.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/gofeleximutizep.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/nuremugefanokerofuwojunu.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/4677393850.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/85c8897c6efefff892a1d3f6a721b1e8/73853644913.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ad32e545d30c22a78a5d56e06d401a3c/wuvulubi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ed50e15e---78439309301.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9kh3nqqm17moc7qtf3fv2d6lml/safenava.pdfIn PDF document text
    • http://cwesp.biz/upload/file/nagonowep.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b8c54e9e176---viwufekida.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/39608936746.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/839880646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mosque+design+plan+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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 10716 bytes
SHA-256: d4273d53832917cf004bd3a7abad92dea984eff7f7e44083d3f2799f1b402afd
font_01_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 19000 bytes
SHA-256: 286753b10184988145b8be9a5440fa4de433c95eb695856b1ccd8a9dc231bae7
font_02_sfnt_off000135ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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