Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cbd20393f15f60…

MALICIOUS

PDF

86.9 KB Created: 2021-08-25 10:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df8a4d9138d8df843e9f9ae1400a06f3 SHA-1: 5bc1a57511b37d5656a6a252d0bafd6232df82fe SHA-256: 87cbd20393f15f60acbb6be37bcab78461e229e1bb7d3a045826febaf3db7f23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/zezimopovepaxuz.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d971e6e1d8---lenolen.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/75517428319.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/derodizi.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vowipaxedevozotoguta.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/56044692321.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/48612917465.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qt5ghnna6nnuhcbkjfalen66o8/powamozexitodo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1f3f42b4e945053541312cc8c78ed2f4/ratilufote.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/37151411158.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e4e8d6b9f---dexekupazoxamititiwal.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d11dce1f15---fesuxekutogexojerurab.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/vejadegoposugitumupa.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/vitivamivamotedone.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/57341190424.pdfIn PDF document text
    • http://kleiberit.ru/files/file/nedusiken.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/xewurolidi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c3a756434---15343089296.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/rufumugup.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zelidinerexena.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/762511d251ddb4b571ff9b382e0848ce/86624399786.pdfIn PDF document text
    • http://nakatka.com/files/file/mugul.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/mirakaxidigakimewimuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=past+euclid+contestsPDF 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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 17228 bytes
SHA-256: b3432b9c730be4423a9be7538267384fec0d44356a78ebc23fdf7f75b0e4a440
font_02_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 10364 bytes
SHA-256: 857da7a43be49dba1432a7b566aff080cc4df03812c3cd19eac7de0168133a4d

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