Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96ca0a7a2c57560…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 12:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13a3d2a6055a758a06d15ebd9c24faf3 SHA-1: 8aa40af85e4587c61aeb55b514e42f33d8aacddf SHA-256: e96ca0a7a2c5756023140c9ab08d9adc8b567f0375872debb38832aa74c9373e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous unknown URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://prawobrzeze.info/userfiles/file/pigodatuxosasopoxowenunuj.pdf In PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/mebutupefepojugixite.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/14207045672.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/91890262183.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161094bdd708ab---85507930917.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/2040207387.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/65174003563.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/moretobagudemarezavexebop.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/meruvejokovigenoxope.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cb1a9b6e---44385494683.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099eae3cfa4f---64776274070.pdfIn PDF document text
    • http://simonide.org/userfiles/file/52609026269.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d4af5a003---75649337447.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/vujogabep.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20dfc62c4---32062802074.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12954679840.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/94795990212.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/novemimaxamaxifu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5e074c77a3f859a3db0e786c397751d6/lujabupaxovejukuvoka.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/24460513892.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/29688186013.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50f5411ca9---81566781378.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba78a0000b6---82491458896.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fudakizisakadowipi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/92149079503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=converting+money+worksheetPDF 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 10736 bytes
SHA-256: da106b9d1e94742d31fa7a461a3675ce10a0b14676504114ba4572ba12208a3b
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 16892 bytes
SHA-256: 13eae38e1b291453b530c8a74df5d2a7c6012c07f5d3bd3d516854cb567f6a43
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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