Malicious PDF — malware analysis report

Static analysis result for SHA-256 66198479ea84e3f8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 12:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 353c3174935ee51731850b985432bdaa SHA-1: eb0420788f83e468148c8a857cbaeaa25cc4f55c SHA-256: 66198479ea84e3f86691d1a5fdca57e8a727920bcabe2b0848e3ad1bf2cf8e22
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and a critical ClamAV detection. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document's purpose is to deceive the user into executing arbitrary commands. While no scripts were directly extracted, the nature of the lure implies the PDF is designed to facilitate the download and execution of a secondary payload, likely via a command-line interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://goldengatetaichiqigong.com/userfiles/file/wetudugegofivumeguwake.pdf In PDF document text
    • http://www.heksan.com.pl/file/39809936920.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/17194543172.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbd7c13fc---767437263.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092010240857.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/20692403923.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/4616360198.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/kumozejerujironezidu.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/gifugi.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/3164530953.pdfIn PDF document text
    • http://congluc.com/upload/files/41486126208.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/89075652327.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/40764188447.pdfIn PDF document text
    • http://protok.pro/upload/files/dagogininitoruwolumixil.pdfIn PDF document text
    • http://fivelscope.net/fckimages/36319920977.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/52225269036.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3ef8edd4898229d3c9a6b130e3b779ce/ralopufigumup.pdfIn PDF document text
    • https://31app.com/userfiles/file/48250315162.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/xubakigusiwesu.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/lelepileretodaremonupoki.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/gobijajadozogubezawijamur.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161483fabd7aa0---nujavubugosarubapikijovak.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210916101126.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446f1cb76c8---talaw.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/gifanakadut.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a010f730---78904176710.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/deregokuvenabuzagekefoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=otg+pen+drive+not+detected+in+mobilePDF 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 17200 bytes
SHA-256: 1cdf0757aa0792b23a1a33a8ff3ce53727b0eec37d9592c5c9e1abe79009cab9
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 10756 bytes
SHA-256: fa1d9bab88212cf8f5358b1f8cc0a5aa3cbad086ece9477605e03ff1365c5807
font_02_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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