Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afe5f1c4d96e25f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 10:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a38580b815151b2d950f2f332f138a58 SHA-1: 9433f38dada001acdab5829730823b055fdc60b7 SHA-256: 3afe5f1c4d96e25ffe9024704fd6eb019e2eca13a1065d68641b070e289fea6e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://plymouth-logs.co.uk/ckfinder/userfiles/files/53141702049.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecef21130---wunibide.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/35460700770.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c57f9e97f---58262810606.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/48869157226.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/9716028382.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/478da097a8171162d81e6754e650f830/27912496719.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/rorixoman.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/labuxigelomum.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/zumamopusoladi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5fea48b0681f6fa231655b9ba21005a3/63825666794.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/noluwimijotexabomefujiwa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/28e0959e76ea369c4fc340938280e94e/18611397613.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160809d81a0c27---namumedatodamuza.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kidewubila.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160947167b07f1---29204171231.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gru600tvbfs87cckrefhjbpio7/zibatazozal.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/nolesosarup.pdfIn PDF document text
    • https://proia.bg/userfiles/file/87359364933.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/tipufunofibovetivijimuzaz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/u116lt360q0dq2ehnmqf88ke00/10485856800.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/kojakoletafonapesif.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hl35t8amemcefngkdkhtrgak5r/21460940362.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d5a32591c0---69192038415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=verb+to+be+esl+worksheet+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1f67a5e58e44b47954f81efa4839231a/73645411991.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_off0000bc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 10524 bytes
SHA-256: d8cb31adb848c667b7dcb87c3dc972a19d7161c9a3c3cb5a88731164e8ab735e
font_01_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 15768 bytes
SHA-256: 524c03d173339375385f737e4c5f7b7055d027d3158964be99f97904254ec354

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