Malicious PDF — malware analysis report

Static analysis result for SHA-256 00009b70f34e66a9…

MALICIOUS

PDF

147.1 KB Created: 2021-07-22 14:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9f71f90b5873f4a69fff15b1bccb834d SHA-1: db791dced5b9d93ac6c3739ae5ce16d0257d9227 SHA-256: 00009b70f34e66a9d6db0b27cef2603dd5927d2a12b64bde54957f82aaff84db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple compromised CMS upload storage locations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document likely serves as a lure to direct users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b851bf5a7ba3b0ea40d5f2d105748097/suledelevakikupon.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/57ec1f361d4ed600bc24ba1fd1602813/21839116167.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/35195077788.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/xilizidiriwisekubebogap.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098132658490---wiluzuravage.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5612bd04fd---walawolifimevuwukejuv.pdfIn PDF document text
    • http://industrialdevices.in/uploads/matefa.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/13367306774.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9def8527b---89114434959.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5a8249dfc---zuxujo.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/39963316542.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/ruxewefewivetakinil.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160713409d6b6b---9948754016.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/pevofuwinofozonejate.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/48977102945.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/79691608660.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/c398da5f40a08f10bf03222f42e2ad89/8978211562.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a429f119900---rugapixawute.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/bofukex.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/funujizilagiwog.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074648f335e9---37683181106.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/30427800159.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97125109d---kunasejudiw.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/50053243902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=words+that+rhyme+with+purrPDF 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_off0001dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD87 18480 bytes
SHA-256: f54654c6d0f7cd103738e08b5b98057eb31ad2eae705008a5984ae8c80bfc899
font_01_sfnt_off00020e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2261A 10800 bytes
SHA-256: e7673aa46731707c4323096b4dff76867ef11b4db5abc9fe1b0992815a7d5377

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