Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dfda48d0bf5d29…

MALICIOUS

PDF

92.4 KB Created: 2021-07-05 06:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35ca7fe89ce83d288c1056c4e7d8b4f0 SHA-1: b3ecabed1d3a903b17f0b01786290a0739a6be11 SHA-256: c9dfda48d0bf5d29fc0f69f300b600726489109f1e40cc0456e3303c6713db45
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste commands into a shell, a common tactic for executing downloaded payloads. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945d27235a5---xutajizon.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d3fbdc3a---92728662511.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/k3qnernq173tl34iuog79am894/remiledukoga.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/af56629c425cdf45d276adee4f148a5d/lasopumogegoperoba.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444da8fe6e---88253014044.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b428f3879---60502330097.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/59168589949.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///14777372080.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c5cee06554320cc7a7769b56d5cf702/pateniwifezulufakireg.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdfIn PDF document text
    • http://kingnature.ru/files/files/66378955078.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/28deff9591c95b7f5e9d2995da60e50d/mabeg.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6467ce7de7de4ff9b575906e1f709f88/guninelalixezufu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874dfe9e816---fokuwazuwewa.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fac7752ae72adc0d1dd95022c3f4937c/bofotanepuwuximipidazipa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c247f0e21---83324025438.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3755c17fc1---19344397886.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/51bddd22c51d221d180c4dd5ed93111c/zulafinuwulitebinup.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe4eb32aa---pafudiba.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/76da437eeae5db267570cd0af47e0f00/xazigukakovemuvagep.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/h33i4ir1n8vnnqkomvjq74avun/xutixuremuged.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc218d45472---49003996896.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dvgjrq14v0fud83io1ca29eh61/69006408829.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1uss914acj6hl3uiaof0at5gn7/84258689580.pdfIn PDF document text
    • https://tavio.ru/files/file/manutiralu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=macos+recovery+usbPDF 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_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 10296 bytes
SHA-256: 225e084297e88b1e26dfa7ee4a9610a9e2193b30ecd301f3093fa75083420a10
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 17468 bytes
SHA-256: b9fe64382f71bdc1f59773adcfac2ab4d4741fdba460d3ea5fd6d1e64a07c198

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