Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1961b62f469b47…

MALICIOUS

PDF

77.0 KB Created: 2021-08-17 05:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45257b4b9a8cf7431f43b30f4c84b2a4 SHA-1: d93e413d51c9b176fc650d3b57c80b8e8b4b6c22 SHA-256: 2e1961b62f469b470501d2b85da90aad30b509624ad169c460be5032c128fec6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and a link farm pointing to numerous external PDF files. The heuristics indicate that the links are designed to lead users to download content, potentially malicious, from compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/79590461354.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/738791673.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2046532854---53324448531.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/37748595125.pdfIn PDF document text
    • https://masihpt1.com/contents//files/9017379643.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/kisazelilemisumog.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d688373d5b---naduxasuvawuli.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/32ff780121c7b3683e396d0c9050481f/28328667254.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/30545943740.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fe3ca29e808ccbc16c54bbb51bebcf8/52694734264.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kamar.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e766765e---49774641544.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac114046d3e---fifonasiputesapidug.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a71334507---tivemo.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/91125429268.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b237a981a7---giwisadazizuraxunowixaz.pdfIn PDF document text
    • http://asustainable.com/global/file/89212884645.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd402627c3---40849502054.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160958c3d9f0cc---sitavoduzapujodizesod.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xoludowoletorenagi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bdd102e8093---xokumemirosawer.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1f70c2e6---88274224373.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/92636282529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+pokemon+emerald+gba+isoPDF 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_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 18040 bytes
SHA-256: 287ba4427989df57217d38dea1efb6d01be36ecba62465cb14f4154c3f12df42
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10956 bytes
SHA-256: bbf87d52ff23e60242c46cbe2dd8d260547f11c916abd9d1add740259d7c1943
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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