Malicious PDF — malware analysis report

Static analysis result for SHA-256 6724081bd62e3ca4…

MALICIOUS

PDF

92.9 KB Created: 2021-07-04 15:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f893119fba02527bc61e6ab0b456390c SHA-1: 020ca44840e225a8d4d88311354534b7707cc4ea SHA-256: 6724081bd62e3ca4730696f8278752382398f3b1406645ccb16ff9d76a6bc363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate the presence of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893256b5cba---87303067587.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf559ec633e---60266189216.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/43648090079.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609420b4dd360---xofesikopod.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089252164c51---87583779963.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/25818093514.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9a5f335293d4cdfd307b6e2175005e07/58376938734.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/224e6a5ad5f0a900bf326848d4098698/87872087631.pdf
    • http://consorzio-csa.it/userfiles/files/pivefinonupore.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1o6cdtu59g90790d6kjd8iaia5/xobuxejobeg.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37098057dc---97478700440.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/pixokuvagivonuvel.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6197b5fa170636040adf1baa9ad53deb/vuritoritif.pdf
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/lefukawiza.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b65jhnnea8h8b8002g7up5g3i3/98056874931.pdf
    • http://mikomisushiwc.com/uploads/files/97135757466.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tevizamofirodafovedon.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ce3147545---fupafuxomojuv.pdf
    • http://ahkkpcm.org/userfiles/ludisodavinadamado.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/73f35dd5b261d022cf3b0de519346913/76658711335.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8ac4954ea1d7edceb62961acac30d0b7/debufefenazudodivagapet.pdf
    • http://greece-ex.com/images/blog//file/dudevefunegavomidubixakev.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/gepajivujetera.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l6bc12rt3jbi5vevpufee82o10/dafogojed.pdf
    • http://el-master.ru/userfiles/file/pupojiwavimokazibodimif.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/8672379254.pdf
    • http://dlevitin.ru/fck_editor_files/files/nazisumoduvuvelikudopod.pdf
    • http://maasmartcity.com/userfiles/file/zuroninigurebodi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=laser+particle+size+analyser
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a92.bin
198d3c37071e7c9308906365bcb15cd2c69ea99b661eb03098683d5d709045f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 16872 bytes
font_01_sfnt_off0001365e.bin
5f53d651c09e36cf56517967d566021b576b717a988adb86cb6507469a7e6193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 10376 bytes
font_02_sfnt_off00014e01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E01 16792 bytes

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