Malicious PDF — malware analysis report

Static analysis result for SHA-256 050064c193f07c05…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 19:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37a55df38b841ceb053d3be2acc3a664 SHA-1: ed17c30d36acebb2a78dd3f7b524f0e7c8c65a85 SHA-256: 050064c193f07c055340197840dc6073b2f9f879bc038ae5cfdbefc2ce0289be
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and external URIs, indicating a malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document is designed to trick users into executing commands, likely to download and run a secondary payload. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=android+studio+setup+guide PDF link annotation
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/33240616295.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/nibanosekuwosu.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/34950197025.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/4786600703.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/14d8daa88ee9ec179d37f00d67e4f7de/rakaxijifoxeduvefukuzo.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/79131563799.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/sabasufet.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/nozofatovixikelilaku.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/juluzesufokexodujogugin.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/tovolezexabevasobilug.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_6C7E9A0C4A08495F.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161341e6da0729---32513628642.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/59696808820.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/binodemobes.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///rafomajisosa.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/24482413407.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/vevusuwanok.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/61287362542.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/kiriga.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/upcns5m3ublo7bvhe61pto3cd6/fasedijoboxofudogu.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090414195070554.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/1442946729.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/xojito.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/gaxamej.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_off0000c4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 10440 bytes
SHA-256: 258676d2152e2df81e85bade6661ac03aef10fd7b314914dbfeaca3477832d5a
font_02_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 18020 bytes
SHA-256: 49b1302259a8b6157c8876f78dcdb94625fe955099612044526a70edaf9bab31

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