Malicious PDF — malware analysis report

Static analysis result for SHA-256 4197548a059d4f80…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 17:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 508729533253ec8f15b66bf85493bfec SHA-1: 5c81a802a005a844016d3bac0d61fd7c222f0882 SHA-256: 4197548a059d4f808d3f691d3c0cd0a0e3e0787d3c1d3f4b3e95ee2a59781468
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to disposable hosting and compromised CMS uploads, indicative of a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the intent is to trick users into changing payment details. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with malicious document delivery, likely exploiting a PDF vulnerability to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://notarbrazda.cz/userfiles/file/ In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7ad28b502ce05c5dbe8fdf0ea9e3e365/zesopanodoninetew.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/4a59323c45a7d642f341d531f2b4a5a1/xiponuturafobuvezebadup.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/73141050662.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/24562067179.pdfIn PDF document text
    • https://geniodelweb.com/file/608037644.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/29842841147.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/55498293004.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/15756048890.pdfIn PDF document text
    • http://enricobarraco.com/files/mekuluvesasabo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc85bad7e38c32b50800228973294b32/dafibefavarejamemaminap.pdfIn PDF document text
    • http://slsnn.ru/content/file/55040089230.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161394933b905e---farusaxupuzebikana.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/26712061049.pdfIn PDF document text
    • http://podushka.by/files/files/26652263835.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/15070335779.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/sofalinot.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/gilovamoke.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/gigaxawesitimi.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/munirawutejoruzop.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pivimemut.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/bofuz.pdfIn PDF document text
    • http://talleresjpg.es/img/file/xikovagololojilepenewuju.pdfIn PDF document text
    • http://screen.by/images/file/91427702763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+can+i+locate+my+tabletPDF 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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 19592 bytes
SHA-256: b4b97c995d45fb49e83ed225136199f53974fe911b8ca25c17d5301fe3920454
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 10452 bytes
SHA-256: 38eedad37b3cee490bdde2139e6027c4fec811386eb50b0511952ce3ea13c999
font_02_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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