Malicious PDF — malware analysis report

Static analysis result for SHA-256 158377701ade53f8…

MALICIOUS

PDF

117.3 KB Created: 2021-08-12 18:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e1c202fbbefb53b7593cf1896a1ea87 SHA-1: 8d3dce8596f3370ed1c95aea3fd92a5a58e3359a SHA-256: 158377701ade53f8134c108b2a13ef754036a7425c98dd520383ad022545cfd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable domains suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mwflower.com/upimagesfile///40220090340.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f3eec2c66ed20095313019cb3bfe5856/zazuwijutisiwilideb.pdf
    • http://ascensionchina.com/userfiles/file/tatodesilowutepixodipodow.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea776afe17---takuronarelolagebo.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f48a1ff3---jonukubatidujubezara.pdf
    • http://meadescafe.com/userfiles/file/44531776475.pdf
    • http://driver-jazda.pl/upload/file/xamiwesi.pdf
    • https://funke.be/data/file/59932982922.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3008be9b---nofujikatako.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16106f0f9ac037---nuxuxetimekarusidox.pdf
    • http://alfavit.tv/userfiles/file/rokaxukivotajul.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/669464e6ca7bed4c878a2fddf783a2e2/mowobuzuluzo.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/65754953882.pdf
    • http://axwelindia.com/uploads/kupedasazufeguxivevi.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a838ae89b218ef28a67f31f23bdab92e/91699393296.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c66c56468a733637a2100368e752fd6b/ramiwadu.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zuvukudani.pdf
    • http://china-miyaco.com/img/file/2021629124341.pdf
    • https://pypconsultores.mx/userfiles/file/pulowolutivasoleza.pdf
    • http://brkvinc.com/userfiles/file/33386277420.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l1hlc4pvb4l0njknp49dqfki36/77407821958.pdf
    • http://abbwingslynnhaven.com/uploads/files/59636267352.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=maria+asuncion+arambulo+zavala+wikipedia
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016640.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16640 16792 bytes
font_01_sfnt_off00017e52.bin
c29e8b2afe4633834433690e3ed36db277f2d3900e908b104863ee96ee139866
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E52 19028 bytes
font_02_sfnt_off0001ad8a.bin
89c6c7b2ba602690e30a6ea51a8ea3696d4ca3d1dd0d77bf38b1d48e68fa9121
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD8A 11112 bytes