Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44b48cff66ccfeb…

MALICIOUS

PDF

78.8 KB Created: 2021-06-08 20:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00117ece9c372cce2d319854f8caa3fa SHA-1: 4e5fedf4610b1a6a4bda855b8715c67cb4874635 SHA-256: c44b48cff66ccfeb578a7461970a8e21da82066ca59d0c36f2e502f9579648a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to various compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=hdmp4mania+hollywood+movie
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc56d1929---8573241609.pdf
    • https://anmimar.com/royal/userfiles/file/vavarupesumobapinasirow.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ed5e4489---41920268077.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/11695745848.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/744b5ce09cafbb5c9c19687cfaed878b/wakatefezedamuvi.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9ebd8467bbbea8fc76266c899eb31096/zojolaxasutope.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b29b09aa---tuzapa.pdf
    • http://berbun.com/user_img/file/tozitipixepiwuwekefopesu.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/70492035573.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9169f43bcb---lanisopi.pdf
    • http://autosoftware.company/autoresponders_images/files/sesavudavojawulebemogafer.pdf
    • http://medicapoland.pl/uploaded/file/koragabapigugabisovewirol.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/q3bap0frpt7oaqqu00ga53fet2/xazoxuvesado.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/blt495qp055suatm11q55cd846/gezodilirodetoveruloreb.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7dec532fe11ce0b167e090b2164d877e/91400413205.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094396ac4d3a---totufebibanilojedaroj.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2763398c6ad9d8071d8deb64340627a3/69929841529.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb23.bin
01632ce6e785b3b3c7f62b9b909f9d0a725885e5e480e076b24353e1ac8f4d53
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 4936 bytes
font_01_sfnt_off0000fbd4.bin
67465865fe180fcb57159826a8d3bb2ce29be770b8151f53cbc965e8205231c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 10644 bytes
font_02_sfnt_off00012043.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 4324 bytes