Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9d93439a974418…

MALICIOUS

PDF

102.5 KB Created: 2021-07-24 09:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3eab5ce5dca9b1b9502684d6dd93c316 SHA-1: de7c56614118ade3a9a529215b0b8ce2b6f7e08d SHA-256: 3b9d93439a9744186a12de8f5f352f565a04ad58cd62c15bbe1b630db69b4f8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm designed to redirect users to malicious PDF files, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc642d17069---tivunazemuduvuku.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/r7619kc196t4pb8fhr4ds3bqgc/38705527641.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062221274870554.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/50q16earuo8uiiapdaaelab2g0/58857854552.pdfIn PDF document text
    • https://activepymes.com/pub/file/tolanivekazejawuworos.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lopanolagivujibadenen.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091634c091c8---55205927462.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2062db368---35880327738.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0802367c1dd92304e9cf9680c6d9d30c/poritorexi.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d89a414aad54db041288bc88615d67c0/36967233136.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/namisodona.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/57223722468.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hp28311itj1ncj7iovjevs5mkm/64501936652.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/99594896357.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866fec1227---duwonebogiposinazorimebel.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fajabogofoxiturobino.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/40556756237.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/43896622124.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/85772922539.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a920b9a13---duxaligub.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/vidunuzazan.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d075c82cfb2d32767df7b58469ecc9e1/15882253655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+album+completo+de+lil+peepPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 20596 bytes
SHA-256: 0f08a779161fe2efa861f3c60ba9ea66de79a01c0d800528d60152931b0d85d6
font_01_sfnt_off00013f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15788 17560 bytes
SHA-256: f88b6e41e25e9f7a30d2c32f1ba466285f8d65a59fa42fdaf6362d1f747a7a6d
font_03_sfnt_off00017235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17235 10996 bytes
SHA-256: 18642e77b24cdc495fc41fead91b00ce80779a6502679144afa78064630ed342

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