Malicious PDF — malware analysis report

Static analysis result for SHA-256 3958d06ec6a8ef45…

MALICIOUS

PDF

100.6 KB Created: 2021-09-26 18:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdc604d7e165febb4371dc1721bf355a SHA-1: 4c54d9b3e0eebf6b0e1e35fd90ddb1c300ada412 SHA-256: 3958d06ec6a8ef459843b7e21735b60fa6bc80cfb971a721fd25525ef78f5a25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable hosting sites, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded JavaScript likely facilitates the redirection to these external URLs, contributing to the phishing or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pistant.ru/uplcv?utm_term=gameshark+rare+candy+code+emerald PDF link annotation
    • http://npi-management.fr/ressource/site-image/files/87969626553.pdfIn PDF document text
    • http://iphysiology.ru/upload/gezofevoretepipow.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/48077341766.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/ronuvizupo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/zoxadunonupodufanakuwiki.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/mufabunatixezexi.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/welejixobokod.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16130286b1ffd3---podenipobetatoluzatapeliv.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd731719b---70117737825.pdfIn PDF document text
    • http://briztravel.com/upload/files/59093741271.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/sulelove.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/sanesewutoforopugedimomo.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/jazatudekibe.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/pelaximapugotasi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/92dacb53e00fcc0f3a755114afc4f607/90870385498.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/21587864730.pdfIn PDF document text
    • https://esvigo.com/upload/files/61170640447.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/wafezekulodad.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/xajemidesabinaponanemoti.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/dexigizaledivowirizigelu.pdfIn PDF document text
    • http://compsult.net/userfiles/file/46526577619.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/66192124320.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/11291555638.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gusolelowavebusivenuviti.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_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 10692 bytes
SHA-256: 5275937e21e1880cce6efa80a722d95f2e6b172900a9eae026476a48cdd55ccb
font_02_sfnt_off00014ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE7 21624 bytes
SHA-256: 84aac3c728a5426564e357f0747b97b1d183e139ec4cf846378bc397e8590d22

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