Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b2d0feb42c0a0c…

MALICIOUS

PDF

103.0 KB Created: 2021-08-03 06:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b820eb9592fabbc991f448da31903462 SHA-1: 8df8e03c807baf82ccb837dee67aa6e041c5d2e7 SHA-256: 43b2d0feb42c0a0cd19955fe663b84dd2b7e5e278ee5d08f922bd9fcdcae0633
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://nomylo.ru/uplcv?utm_term=veer+zaara+full+movie+english+subtitles+download PDF link annotation
    • http://www.jacenter.org/js/ckfinder/userfiles/files/noluzenavike.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/83165892877.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/daraxenuvikokosir.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/16416294099.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/5a51b282a5d1d3a78f98819a5ca91987/balewodosikuwoza.pdfIn PDF document text
    • https://waroproject.com/file/30327900828.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8a9d1d28---vegokurofosivunukirib.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/lalaru.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ae11d324---gefavotina.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/4614087351.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/d3b2f2a340d53959455ebb02e7faa8d5/99042139651.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/25407541763.pdfIn PDF document text
    • http://jarosi.hu/files/file/zawefiw.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/fct13glriep690d87l45t8m4no/tewudogebunovef.pdfIn PDF document text
    • https://castel.ro/userfiles/file/18605875081.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/502qvdeq36cfv4g0q05dsgooc7/vopavez.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/dukoni.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bcd8b167---4489361581.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/zamiwowogodizakazoxor.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74f71adda---botopegusafezu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3786a4752f---kiruwedologeze.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zazanelilobekugipibe.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c6e8b7cb---fosipigu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00016e20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16E20 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 11224 bytes
SHA-256: ab93638d667e00c30a9d25c0877af255594280d001a00e97deb5a138925bf5e7
font_03_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 28356 bytes
SHA-256: 826549e2d45ab1a7e268881a29fd9fd557d64a1528c706d6468d2d96f24de666

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