Malicious PDF — malware analysis report

Static analysis result for SHA-256 d741a1af3d0c0981…

MALICIOUS

PDF

95.8 KB Created: 2021-08-01 00:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1825d5a68c844d5a6edf6bfde126d8e SHA-1: fc8d803143ef9429a7378c9580d933aac1f6bf43 SHA-256: d741a1af3d0c0981590990270b7f19e50c83245f55c352bd8937ff737bc935fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=what+are+the+barden+bellas+names PDF link annotation
    • http://csc021.com/userfiles/file/20210705170123_ck8lm2.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5e09acfa545b12352646967270765f94/bobowarinam.pdfIn PDF document text
    • https://motacademy.it/file/11953219152.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/6e6436f4f931725720590f39507f30a8/73236091615.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160865c03b0ce2---8304190878.pdfIn PDF document text
    • https://777mto.org/contents//files/83562885644.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc51351a5d---kuxumuwojimulomenuba.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/41324043882.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/op9ahim85h4hcd1fmi2jl41h24/86079987980.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b1de1555---bubotadubifunetut.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/86b44ed6dbde4379e362a62579891738/83955143089.pdfIn PDF document text
    • http://rideco.hu/upload/file/serupukiluwabosoko.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56117c4d7856f1424b7fc16ad2dd16a5/rexuwanugakuvotaja.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0939e08baf---63517694272.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/n8ag3321u5a2jijbemn3m57963/5578683588.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/60593186532.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef318d937---tagazobowurupewosaguwixol.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acb32552e4b---47399737414.pdfIn PDF document text
    • http://rideco.hu/upload/file/82326493580.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210629064846536.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077e548ba8df---14186750338.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zopaxanovinubetusok.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/67664985385.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/327831a13f44f7d6f67e09cf9cf3f7cd/repatunudefalanakamikoli.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_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 10436 bytes
SHA-256: fb0c48f4e67faff9e6ffe6ed14aa8813731aba6a922e19437257625ab163c3a1
font_01_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 17620 bytes
SHA-256: e3d5bb13b83001f4e9e651b88abdaa6cfcd99c64f3a1f1cd1fdae9fb7eceff85
font_02_sfnt_off00015843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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