Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff61b63c73be00e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 13:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f4cacd04202c724ddc4999ff52291c1 SHA-1: 52553b640bf0d2c4eec40a59f39ad70b0bee72e6 SHA-256: 8ff61b63c73be00e8529d831b16077d5bcf35c0e2216ec3a4e1374721230d713
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160723564bf43a---80565925451.pdf In PDF document text
    • http://emannsltd.com/userfiles/supitewipuwero.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l3nv8hlfgu4dkm89f46l5jdan4/zuvogopekuzuxiraweki.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/kgr51cs9b3fjjd9e2qvp37brv5/dukogef.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700fe3619d8---55230676007.pdfIn PDF document text
    • http://artdental.hu/editor_up/48934404588.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nibanuro.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/71187173792.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087196ec4625---85025592657.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba1019513---xodokovagugexa.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f451c72971---kavapomamagowamazobumege.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/nuxaxatowenunir.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/nojatimaxunanasevabu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0noh926bn79c5i0v22pmjm88ph/vituperuxulagevev.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b13cfd88239---99035081299.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7997afd52---59075951930.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/batigibadale.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075970789cca---xibimukozuvebonudokumov.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/5631642087.pdfIn PDF document text
    • http://potlista.com/file/files/57246351163.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/mavepawojozaka.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/sifos.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/40940151474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=marketing+politico+ejemplos+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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 18504 bytes
SHA-256: 8eb711968ff373a8e8bee5c40189f0104e93259511732857780bce1e72a674fe
font_01_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 11180 bytes
SHA-256: e8310823b824f2fa119968771dc27546e6f5348f3da701887f3a4e67aa0b5539
font_02_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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