Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c51a027ad05948…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 14:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ab7fd9ed8a0cefaf292e101d2c17148 SHA-1: 4f6887b6a12e2ba77d54f192ee97ce39e0189456 SHA-256: e4c51a027ad059484d66234a60dcabc45b0b884918f49f81b77a656dc89097ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134a20a0daf4---reguloralizovo.pdf In PDF document text
    • http://ameshamagazine.com/js/upload/files/safawonuliki.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109082358371043.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/ririkugurinevigop.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/sawiwonubetawabinawivari.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/20523759423.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/27380308339.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/30197141836.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f71b1aff---47500437777.pdfIn PDF document text
    • https://aashianarealty.com/file/61592110263.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/82709036794.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/esrlkrbbd4jr9oqu99cdj0277f/99821383446.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/88469892211.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7f91fcb3f40676d6c7b685def59f022d/guvevosatukupufelofow.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/matarujubirufoki.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613909122c22d---35713128517.pdfIn PDF document text
    • http://generaldistco.com/images/file/40352591885.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/59954204621.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/90366473095.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/35352909674.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/96919750042.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/mipedofugamexopitusesoki.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/vosubawetotitisoxovape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=luxor+game+free+download+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 16388 bytes
SHA-256: 1f26bc8bfb6cb6f728ab40502f02c46c77a50b39fc36419725f3c4e74eb8f9f3
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 10676 bytes
SHA-256: d9a1b8ac678e9c3b3806330f6f3eb6f32d0206286278bb1f1d038346f09c6374
font_02_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1