Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af093762bdb986a…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 15:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac4497c53f1343809f881494dcc58f81 SHA-1: 76cdae698bb3614c31b7278437fd3a34a2fde4e6 SHA-256: 0af093762bdb986af2ea5f72e393f1a965a8cca87d1ed6c55f78d0568e076809
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files, many hosted on compromised WordPress sites. The presence of a download button lure suggests an attempt to trick the user into downloading further malicious content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://health-bridge.in/upload/file/begofupojef.pdf In PDF document text
    • http://houselandia.ru/files/potofurezidogolegepib.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/96921131697.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/27297345229.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/89603806349.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/87872289234.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/16203897157.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/015f85f44696f58ed501d31b8041ebb4/66791609461.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f7cb86e4---22878862298.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/79125104458.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b1005eef4a9a133a6809dfe45c757fbd/51302133177.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9032add5c4351e0afc03df443c4a1258/jatudu.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/jeninetopokedugeme.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qrggh5k5rbrmfur8jk2sclhcr7/10826322173.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/de8f51223cc04273590f63ada8cc00b5/jozunakudewidoso.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ig8612deqdolui1s1ooh5f2r6b/zomulisibageni.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9ba54593f99598ddf046bccaa8b52b62/40836770969.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/kemupokatafimiw.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0011079c55---puvujagobudonopadanevalis.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0272048de5bfd342b9a049ab376ff2ad/16551197395.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/giligafutaxur.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea663c5b7---8709758030.pdfIn PDF document text
    • http://93564497.com/userfiles/19020521118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tower+defense+king+mod+apk+free+downloadPDF 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_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 18024 bytes
SHA-256: 476d9f62999efcba51983f84f4bdd0ea0dff92d7c93e7973099689f73c8b5195
font_01_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 10884 bytes
SHA-256: fa9c0db4dc25eea01300a71d3ff520881982a72fc7e0d7d1a5739840f76ddbab
font_02_sfnt_off00013bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1