Malicious PDF — malware analysis report

Static analysis result for SHA-256 52091b98af52231c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-05 03:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e046693e03c20fc6a7a8284b29fa4c2d SHA-1: aabd0d4b4279b366616c38bcc328e2afb67f1f7f SHA-256: 52091b98af52231ca507675d55d58f2fec6ed192109c4c3debfa240bb6a00513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a broad, opportunistic campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ventadeterrenosurbanos.com/userfiles/file/xaludewetonunuxubuxuko.pdf In PDF document text
    • https://ctapigroup3.com/contents//files/junarogikomupefaruneji.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ddtfp5gac6d8qtvqkm1gb4r175/21960230657.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5392dc0bc2---39284612895.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/pudewaxorewafok.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/37384596538.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s6nit32rodi4070e936j967r02/68400709741.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7f13bc2b9e5b9073aa54c50e5bd3493d/59847368662.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/53621118390.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/li5gpsp5ev7qsmv2cdo5krb2s0/80477455394.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gofuxu.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/jujapitesefipegovu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/94860700788.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/v41fr1p7oki0shlgmbai9t4gbt/kepolenujigopelewozomiz.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7c4c77a79---fitijovirutijafameso.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc438b5c1a---sadun.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051608003573499.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kilapinogivipiwovupok.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/wopiwefel.pdfIn PDF document text
    • https://negaratoto.com/contents//files/5744730685.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/96119759369.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0683048a0930b5020b3d1990ce9da77d/44788841546.pdfIn PDF document text
    • https://tierlistei.ch/downloads/88643873654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manual+sartorius+ed224sPDF 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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 10532 bytes
SHA-256: 24d4093856bef2e9ffbebe2c3b752c893781b64b28296870f6db0f62324d188e
font_02_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 14616 bytes
SHA-256: 70dce8a4a63a4a8ebd3384bd365556706e6a1e30fba0bfc5304f1211fd3967ff

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