Malicious PDF — malware analysis report

Static analysis result for SHA-256 778f49aa8796335c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 01:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 435215192099c83bf50cbb5585c932e4 SHA-1: 03785b02991a9551f2f1b9a92c17e3c74198616c SHA-256: 778f49aa8796335c43c1655ca53b16313a8b631151478d14844fa451520bf591
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and compromised CMS upload directories. The primary purpose appears to be a link farm designed to trick users into downloading further malicious content, likely phishing or malware, by disguising links as popular downloads. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://coretry.ru/uplcv?utm_term=marvel+spider+man+comics+pdf+download PDF link annotation
    • http://aep-tc.com/cache/fck_files/file/nukenimunilutowoposomiv.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a978cfcbee098bd1d50272446b21326b/bisiwoturodidagug.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/42439733115.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/3563214150.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/76106686312.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608920f9283f0---42600060084.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/vipegunal.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982143a07c5---22356939638.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/12865156753.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf2f44a9b5---61464594057.pdfIn PDF document text
    • http://atomleasing.ru/media/File/73243487715.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/404e74b67ece3f7ecf5223a2ac4cdd52/giwodabe.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/guwexamoduforewik.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fexotojaxopimiwuf.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1212d5583a1d4e7308f3066725ed2972/59310145479.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902192143.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/tuwesapagizuj.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d666372a28---80033216724.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/fopowevokipe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aed22706902---nimelojegovavaviduto.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/24288105582.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021063021003273499.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccb1a6995---34415861403.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/zerikomudufipit.pdfIn PDF document text
    • 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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 10828 bytes
SHA-256: 7c6ba643c243763c4e55fd3fec6691da195dfcdf07bc9936ef30960f73e40155
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 17940 bytes
SHA-256: c991df50d70d60a2706c0743e4df7f874415b6086eca13e119f53ae4384059af
font_02_sfnt_off00013221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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