Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b67a22be9f79d8…

MALICIOUS

PDF

89.0 KB Created: 2021-07-23 10:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e4494938ef8172c2a9bd921268b7349 SHA-1: ff7ad9a33c9de2439961c03641aef556f7ce0499 SHA-256: 01b67a22be9f79d8fcd65b8fbda9916935dc96947f400b387afc8515e307810b
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm hosted on compromised CMS uploads and uses a 'clipboard command lure' to trick users into executing commands. While no scripts were directly extracted, the overall behavior suggests it's designed to exploit user interaction to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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://aspaeng.com/files/image/files/12660192311.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160827177a6830---zelasepapa.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b0fd8159---69097689833.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/kurir.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/49850879706.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc449b2d844---jenozixi.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/40955653438.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-9/20210609183121163497.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608255e34da22---73507070061.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/jajofolisabolapolukeniwu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37dbddf63c---bitige.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86f306681---18652991277.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tekivokuse.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254b9335d9---pulifipebezo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6jed1ef3lhl05bkib8c077kjq0/78109460009.pdfIn PDF document text
    • http://elitvorota.ru/f/file/56397277975.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/87951693467.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6b04e1d5fed3640b8144052e4a816ed2/nadiwewunivifipovow.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f33764bfa456e13a43d78674c1194ac8/84963243872.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/654c7be5a3a7796bed01afa0a377adfb/rusitozusurupiferip.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mjkpv16vpob7v9ntcnu0vfuert/72517482024.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/55579823585.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/edafc42c64fb51e6399c4154fa784a8a/33058331334.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/lugukifore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=check+tcp+connection+windowsPDF 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_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 17492 bytes
SHA-256: 03dcd59ce0113d53397a916c368138b9c31b6588f293b5518301c017515d2f2b
font_01_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 10512 bytes
SHA-256: 8d640ddc0d815fe440c6039e953ecc4e50a2dfb87625d744f7d59908db132a02
font_02_sfnt_off00013d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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