Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae81126d6f0ce2f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 00:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63df14a70661098109b502598807ce68 SHA-1: b079aacaa21ae23629a24ed77204bf95b025a46c SHA-256: cae81126d6f0ce2fe2e6be895505622c4b17a474b670b90f5b4978c89ca3f999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=the+queen%27s+gambit+declined+move+by+move+pdf PDF link annotation
    • http://lltsg.com/uploadfile/file///2021090717475633.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/59686506489.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/68004539697.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/89960547090.pdfIn PDF document text
    • https://shidoremicrosys.com/media/87237132898.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/guzivagamuzodejuvu.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/824490881.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc8e51e14---8322631640.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sukuguruj.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/dovenidijaparixowimira.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/12715415862.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/16572107403.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/10961440142.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/75784902968.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/25215e03fbb0adbf061efd5734b19f07/93682251872.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dimogisuvofujamujonal.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/lexilapi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd5996195---64340850435.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/53767886602.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/15138700903.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109210504171307.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/puvedujekolavegudegiz.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/59839643899.pdfIn PDF document text
    • 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_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 11532 bytes
SHA-256: 9439e2465c54c5c2323ed4ca36bd8a7aacdf890ac834828134663648c2e92be2
font_01_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 18780 bytes
SHA-256: 9018fc07a68f2d49ff51693d5ecfda73395a466e3d4420d88d39d91ff284709d
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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