Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2f42fdd0d9611f…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 21:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd788768b3ca4c7bea4750175d387439 SHA-1: f9c1f6a50954e5cff3806fb1de826993ffa25d4c SHA-256: 9f2f42fdd0d9611f7dbd9a151a9ec11e412e9749675e14d398153159a775bc4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d6ee5226---2677836643.pdf In PDF document text
    • http://honda-vo.com/upload/file/5137340040.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/069488b38bb763c9d2fc771ab9333227/90752547401.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210509233204.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/limitupixanotelekowol.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a28db250e---21776755679.pdfIn PDF document text
    • http://www.toptehnik.si/images/94979852304.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf417b7cc---nuwagilurujevebadolufunej.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/wizavanejatelajopi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/21068717082.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160834056032df---2814217742.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/37584960485.pdfIn PDF document text
    • http://e-hematologica.com/users//file/kebide.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/55979590173.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/67742693869.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e6b739ce1d514ea5f69a7250906e757e/dikifibip.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d157b7dbc---perosagarezefutev.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/4042306999.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/9345020895.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/soup7ac7t1rehnai97vqd3j2b2/xananalometedad.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c0i44plvhlb5kccpqeie5h6j9u/fusepabumererelizeke.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/96257442111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+sword+and+shield+guide+book+pdfPDF 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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 11264 bytes
SHA-256: e7b45c9c8079674e63246e1f16b7c66e7dbba71693ab073b4c4f0938a0b59dbe
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 18464 bytes
SHA-256: b178b2626d4b42cf9ba46e968e971bced006d9b53c6712585bfbd07e13500dbb

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