Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba338e3dca439d07…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 06:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2fbb68cf14c9045b45cc576cebc20ab0 SHA-1: 564b1b19b603a1c24868e075bc5d5a2f311969b4 SHA-256: ba338e3dca439d07d70b3b0d9b166c69870a808b22e30a5500b976be46efc3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The presence of these links, combined with the PDF's structure, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=how+to+restart+phone+without+deleting+anything PDF link annotation
    • http://union-montage.pl/userfiles/file/54003418193.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/57537592244.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/56243543563.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/53184955513.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614141f5844fe---66745367307.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161463fc3bb1b9---43923837927.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/33442049087.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/11429386558.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/464d0434dff31e6731d4998a30bd8101/8316168582.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/6248066116.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/51930891275.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614138dab07ca---57964189384.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/wejetonufalo.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/26276754035.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/42698655412.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/30972071011.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/edrkd5bvk10co24sjjbhraj635/zeruserofibutex.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/tojixibaludag.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/33603106078.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/17677256013.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/pipukavaguteduwaka.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/fikitasoxedag.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/10051539359.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_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 16484 bytes
SHA-256: 32ef9bcb22f3ac2906e22ff7a029cb0d546f302773f16d2dbc6c175588f38670
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 10960 bytes
SHA-256: 92127dee78e0fa32c9d947bd7817ed4874b4011d2acd358a5df319b0075d1653

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