Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b296f5fb1a18e5…

MALICIOUS

PDF

82.1 KB Created: 2021-08-16 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3534edf128f98a2f4e50440d39c3f6a SHA-1: b7f06c90a424157190564206b610aac750bea6eb SHA-256: 45b296f5fb1a18e5866acfe03b2d0a5d02d3e3edd4b281f9517e14bbc7b2cf6b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a remote-support lure. It contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content or downloads. The document's content and heuristics indicate it's designed to trick users into believing they need to install or connect with remote-support software, likely to gain unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support code/control handoff high SE_REMOTE_SUPPORT_CODE_LURE
    Document asks the user to share a remote-support code, connection ID, or allow control in the context of remote-access software
  • 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://crewmak.ru/uplcv?utm_term=gas+assist+injection+molding+troubleshooting PDF link annotation
    • http://am-assets.com/aom/magnolia/userfiles/file/41378076809.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dse257ja0c1bjebggf1q0hpdmo/84438711962.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/71891866346.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c340d990---xorojevikuk.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b79d9c23d---37279348110.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087976bf348a---lunuwobatosolazap.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1019d06a2c---romuxixuwimeruju.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dc288ade3e676b1f581f5a14cb4c6f40/9847356601.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7b6f3bdbff08a9950ff6cc066f8c72f5/mukaw.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/ferukejebafu.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/kezowat.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/mireleko.pdfIn PDF document text
    • http://jarosi.hu/files/file/67389157757.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c7528c952c04f57dbf38ec3d9b66ab8b/gajapigifiroz.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/69440145703.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a551e293b7---gimefovo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/74899789382.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/89277418994.pdfIn PDF document text
    • http://heizler.hu/files/file/fawaxogabozifovepaxige.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f265832ee16---98815022539.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/raguturodobexapim.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/sawusuxaf.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210531194417_mfsyjn.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/1919317728.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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 16848 bytes
SHA-256: d6d6accf4d2763ebe3eec22265bb204c64de656d617b4c4f191eb1859db361a4
font_02_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 11228 bytes
SHA-256: 63e01d94cea4a70ca9fc8381a321defe1905f429a4325d8062160fd66008d4a4

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