Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff7a92bf90e1cd9…

MALICIOUS

PDF

81.0 KB Created: 2021-08-19 14:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65270196252df6593045480269a0f30e SHA-1: 87264b7ff220a8a8038b87af93506d14c93aad65 SHA-256: aff7a92bf90e1cd9f3a1307b5a08490f75b865e355ab8ecf9490c74a60c356e1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest 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 malicious PDF.

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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8adb023bff0d96216ad05033b9b8eda7/redaxu.pdf In PDF document text
    • http://446888.top/userfiles/file/46822854046.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/78245294753.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807f01a994a---11990508992.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/91186628808.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160794ad129be5---zegewulolunaribafed.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/58153155165.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/tugoruzu.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/90961225906.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/badufolabita.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3cf350dd---gelupewa.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae919f5d7bc---wewotuzafitoxilo.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/bubenap.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/44106789303.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/jekelasibipafamoduz.pdfIn PDF document text
    • http://614move.com/clients/4890/File/vekonolegu.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89cd4045f---28666730621.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/2d5fb3fba06bb5d2b080e72d026e7c99/kasoso.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c4ff0c4e---sagidesixat.pdfIn PDF document text
    • https://tisuputih.com/contents//files/2602332000.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5e63a50e---kegerebixebu.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/nifovokamubikipawuzavote.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062306242670554.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e97b2e9b9f312afb1465fea9272c53b6/ziwafijitaja.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fde6aaf32e1---romalejepeliwuvozagopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+do+the+numbers+17+17+meanPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16156 bytes
SHA-256: bcbafc94df71de8a0a18e6616316e0e7e8eeb7497f5d81de23e49b0f94c7c24e
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 10708 bytes
SHA-256: 9ce3c486936f5d9789d8e8c603d5666f4149514a9d98fe91d0fa7e1f11af9e9a

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