Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5387aca1ba0e16…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 13:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5af4c5fe79cc9ac58d8bf773a476e4e SHA-1: 2700ed8e81af617144fbe08efa804c8f045beb34 SHA-256: 6b5387aca1ba0e162b42ba71f5b536933cbcda7f8aeccd2fa2d3e3e7d8b8fe3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malware or phish credentials. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to trick users into downloading a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://esangsok.com/upfile/files/4114303245.pdf In PDF document text
    • https://clifestyle.net/uploades/userfiles/file/26506953979.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144c26138f4---kojivigu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8mkd8ck2gs7vi4q7vb68dgg1vt/99667218853.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b16de213a91---tudibovesubuxunap.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5ekt6778fuu0c66vutr473975a/poruwividexigetuwizaz.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/sewutebojaselu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d2281714d1c---lojosimerokokujulavo.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/83183705545.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/37487742854.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc878aa00---baromodo.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/surugubakosekolelomer.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160821be6084ed---18156048225.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8e0vtmcu8in6ouu07dsare1f8o/somizofutala.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6300dadf---48058448566.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/75022369217.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/nedojejelarisasadaripizer.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80d947484---wobajoteje.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/72551600319.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/90377191160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=highlighted+in+yellow+pdf+downloadPDF 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_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 16908 bytes
SHA-256: 4c348078d4412b337e700081ebac8820c5803aaec353f80ee6ef2aa272b71010
font_01_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 10700 bytes
SHA-256: f2f4b6b699efbb02afb2e2e1abceff4f773adb903d2fc5eb0f3a2872cb0a6dfd
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.