Malicious PDF — malware analysis report

Static analysis result for SHA-256 525f18991ef70418…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 23:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ef66aef4fe1161fcc8ceacea9c5aa6fc SHA-1: 4ce4ce570fbeb6e498e5fc161b06ff6221d6ea61 SHA-256: 525f18991ef7041812ed43d8e1c4d7311d48f02b7f3762e8ef035ce21ed98746
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the links are hosted on compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 http://kientrucphatloc.com/upload/files/pofixemebijujunafusi.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cbc5ce1e---lemipelozivib.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/30346066354.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/11f89ii43p5thme68erkgubnvs/lekan.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/tunenefifowabasasek.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/fusorajefenitena.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/sazefuzoxumax.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/16637531459.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613206f17524a---xowoful.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e396d1bbce---70247261357.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/defusaxadir.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/ruxisuboridajugowun.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/75417234765.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/zazadeguxenedojuduve.pdfIn PDF document text
    • http://vanhacollection.com/images/files/25752165815.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/71227995346.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f615a10538---58471452088.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26fb2558b---46040673720.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/jibekogekozuko.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/susuxefomitogojiniduta.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dabapetusir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=volume+practice+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_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 10784 bytes
SHA-256: a9d160578ec9070c85572e5dd5f70ab0a92e49f319cdc1e3168efcf1b15839b1
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 18812 bytes
SHA-256: 7fe618867f9c425843307b3ff3305328d2de4772f78fe91cb40971ed3555d815
font_02_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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