Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffed5052d4d1502e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 11:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f572aaa76756181f6ef903d8de2137f SHA-1: 0492448d676a39170559b5e6627960b5776cd06a SHA-256: ffed5052d4d1502e33a60bdad5b69691e15e92721f16ae381e1693ec28b89a26
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a remote support tool lure. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting. The primary intent seems to be directing the user to download and execute a remote support tool, which is a high-risk activity in an unsolicited document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://coretry.ru/uplcv?utm_term=best+app+for+remote+access+android PDF link annotation
    • http://gardenofsound.com/userfiles/files/wujavad.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/xesukobefolagusis.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/8f4rnmhuh6ed304j88kqvv4fte/319375852.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/8308170226.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gofodepewonumes.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/10807124217.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/37622188.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/gidoxura.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/41818089dc4a048e294af57337b1415d/97114114961.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090105060373499.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5dad674876179c660e45d4a0c462c13e/nasuvinikapifawiped.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/refaw.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/21451597052.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/jutamatimefisojesunete.pdfIn PDF document text
    • http://csp.hu/editor_up/6037421115.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/27532330073.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/10161526314.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/61308486558.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/tafavizuzovidavonaditokem.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mofupakabitoxevi.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/digep.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a792487071---55068627480.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kovorobilisebikuwime.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/50415cd96767970eb7d9919cc9bea0e6/kitinofaduvenoruki.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/vazewamopuledil.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_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 10788 bytes
SHA-256: 2323b22a04f11d6ff43c6596774f3e348cf2b052d68cc2e2c3c2e48f19aad423
font_01_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 17576 bytes
SHA-256: c7fb9b3ea2f20b9607113edf8607465751faf3758829e6e2507fc09e0e916d54

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