Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f3348513943c3c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 06:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa38d763ce9b25e4aeb92584a5890449 SHA-1: d4c04845555060d1679ef73f08641548fcf13981 SHA-256: d0f3348513943c3c59eecca286254d52197db780a665bf245e0e29954e5f29a3
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant portion pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URLs and link farm structure indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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://guanzhuli.com/userfiles/file/didibebubox.pdf In PDF document text
    • http://tobn56.com/UpFiles/file/76131585468.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/xatovopobivazevobuw.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff06d6513---40620995053.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/gulobojizulusatab.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/xujawitodotobadebuju.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b214a7605b5---39081495166.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ad162dd6c8f---39924160494.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/vomewikiwutibomiw.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf41a68c9---41237912645.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d177a08c6a---15878010014.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/1593779953.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/tomijaginuwufe.pdfIn PDF document text
    • https://comfort8889.com/upload/files/4440433368.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa0c139cf---mawovizirodenulov.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e5350450---10199490694.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160dde4847023a---73617248301.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/70393601376.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kijuvoxijozukamiz.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/43916375082.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/19103914886.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/1737cae1f56ca5becb64cb09f54771ae/fiminitixe.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/jasakuvutuselareveg.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/girive.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/duluzuleridiniditovowe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/62339779396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lawrence+university+music+theory+worksheetsPDF 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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 17692 bytes
SHA-256: b27eb042d693f861f3fe21b79ae9d93b6692b7e618601cb502bc7e23b94258a9
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 10864 bytes
SHA-256: 343b255562c4b36d3a062022bbee306da88905aafeda537975923074b7abf147

Open this report in the interactive analyzer, or submit your own file for analysis.