Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e65f3485c6a18a4…

MALICIOUS

PDF

80.7 KB Created: 2021-08-17 06:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87af4341b76159587076eb6b8d86bb3e SHA-1: d2737793c14dff23988b1bcc7b248bdcf36a7064 SHA-256: 9e65f3485c6a18a46a1e643ca093810e5a9003da5699e437c9e77b341b5752eb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure indicate an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://austria-ex.com/images/blog//file/27637951083.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd5730377---15834598025.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c71ff5b20c---16477634454.pdfIn PDF document text
    • http://stromzeleny.cz/file/vuwimaruzaluvax.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/mivigidiwafebamo.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/92804589655.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/22629817897.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/91606579248.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45423ebafd---regosalo.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/wunelapobugis.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/18502908639.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/damedoderokemibapudan.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/6209685157.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xenajoxaxabovitezukoxiv.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/zekofazofum.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/59621bade908e4128ab7fbb8c92e6a78/goxobesidetofixud.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/23729596972.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/39d7ntqodoro1a5ffb192kc910/fimitubebenozi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a1f4fad07c12ee463015435424ef011a/kozegexupagonevitofulig.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/19077301360.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be15ee133c---72459891891.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/relukoroduxesugaboxofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=windows+7+loader+by+daz+download+megaPDF 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_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 10936 bytes
SHA-256: f8387fadb20dbcb7bb23a859be06353fc74ebe4392639ecd59d606869ffac93b
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 16484 bytes
SHA-256: af0db2a0ce239f1716b5d7da9a43bc7e35b78dba86210c7c46ac50aac369bad9

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