Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c9f8eb7d4f5bfa…

MALICIOUS

PDF

91.4 KB Created: 2021-07-24 06:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0a458f46814eddfffd64467a1cc508e SHA-1: f26054bb0f62942012072e552584bae564f2f2c1 SHA-256: 06c9f8eb7d4f5bfa396182c9f6dee6c2f6d63852021c3b4107eed4446bb6219a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160761735dea0e---zivozamaxelal.pdf In PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/33116529971.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/15992622086.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7778509a---xuxuwanipumirasufixa.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/jewifakidugebazagusax.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088758d31fab---jefates.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/qa8hci5ecf5gtia146f67le1h3/918042529.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210514/file/daxatelodopotesenidavodur.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/9557434055.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/xerokukadilagesemokisu.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/dusogaxi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d795045d---51037779426.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f272a0958c---90798413745.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8ee1adf924872260c62470478854b38c/92498657639.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a930d583fb6---nazojuvumoguduvodup.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d580bd4650---48161350877.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o41541u2pcvhqkr2vrrd052ju6/nejatobikekuj.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/3fc0a4cc214831dc8659e7755cb09d9f/40721523976.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e976a5166---sopekobir.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/993226992.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6d9bec98ef279e55235c117ae9be6ba8/likilasope.pdfIn PDF document text
    • http://18554080.com/userfiles/file/xumidataju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pyar+jhukta+nahin+mp3+320kbps+downloadPDF 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_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11604 bytes
SHA-256: 754e579eb03d69dc7a81c37ed53e7ddb94adb52da4688e641c2c58e055f95f10
font_01_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309A 17268 bytes
SHA-256: bd3296d1a2c789ad633849a4a883f70137cc0061147958c8cc2ca3efa70c2328

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