Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9ff9596feb34d3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cab4f8f3064a84c225f44ae6767a1a57 SHA-1: 3a47ece290bf1c1cbbc9961f0e7e36d0c20c31b7 SHA-256: 0e9ff9596feb34d3d63af6e436b4ae975aa8df15db24a874e16146760be00699
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095f5a811918---19002871173.pdf In PDF document text
    • http://grandrosso.com/js/upload/files/fonob.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/34b2410d864f3ac6aabfb9f691db2120/24436635452.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/91195438795.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/kivuzedidaratopodaw.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3df7caad5f6e99d183d20e1b975975bb/jedenubuwazewagafanu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6343db22e8af331282f469108ecdf42d/dubatogip.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/21320489869.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/regazabageboliwe.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/66713673928.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/fozuratikeropofinun.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6b4d23aa4371c5aaaeab95bcd0ffc8c2/8065705315.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba28b481a---gopegow.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/96bd03308d32a650e4938bec8cb2e3a2/4542235279.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/26863312791.pdfIn PDF document text
    • http://juentai.com/userfiles/files/xuzexelisomepoxulevusobaz.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/lawagomed.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/46480371779.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/673075800.pdfIn PDF document text
    • http://apex-architect.ru/images/file/53495528059.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/11619344527.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/onfrrpdctinqnishp68nlfuke4/90716701170.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b7vjscdgb2re0m4ur1plqa95h0/89644252969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=adding+and+subtracting+integers+with+counters+worksheet+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/wuzenus.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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 11252 bytes
SHA-256: 850d577372e2188183049f02b88bbda488a5472b5a6f49a724898ecdbd6af23a
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 18056 bytes
SHA-256: ed980715816d3806e8aec7137d47c77400ae717ff7e70ab010ecfe44aebd5dd4
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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