Malicious PDF — malware analysis report

Static analysis result for SHA-256 327f726a82f92ba6…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 16:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 931d9ee53a653edcb0ea3e9ec4c1e2d1 SHA-1: e55eded377a9f4598570ff093633b6296eef2a22 SHA-256: 327f726a82f92ba6860d5123706e375c3c58e4ccfa734c3d207193fc48ce4b29
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external PDF files, some hosted on compromised WordPress sites. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dancleland.com/img/upload/file/jelilof.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608030d04cec6---wawekufotimukowazobi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/53291854130.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7f10d1f73bfc5058a73355aee355d3da/tafarudopevojudugejuf.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815d80a124d---74488241568.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/15607005875.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108291330375212.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/vajokevumabutasu.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/kurad.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160997c7d4bb23---fipavimaseredakiwu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b8a96f43---48799962831.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/koxivarevixilizifumafo.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/gozorenefubaxonini.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89483205d7---gemexumememaduriboxomoka.pdfIn PDF document text
    • http://cl-pub.com/files/files/29091941037.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/pisixemibebub.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edadeeb777---21324320506.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/98824480239.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/zudukodo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/45256633951.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf514baf9---xiridugibedagekefikezem.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/muferaparapolu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbab9d9bd4---tisusafitirewuwosexumazu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c14bf85b---25989275860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=transport+in+porous+media+pdfPDF 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_off0000c90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 16876 bytes
SHA-256: 9e2e19346dd8215bed71db6abe393417f31225d0eb299fdf7241cc9ef6bc4dfd
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 10676 bytes
SHA-256: 435441320c1785c907e677f35d424336dae7a0c6f2e9e9a1aeeee218846cdceb

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