Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b343f92f0b94e6c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-30 12:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 531aa7468f410a57b5c3b59461fbd2ef SHA-1: 5bdeab7f042afa734a17e52a98c283d388920ef7 SHA-256: 6b343f92f0b94e6c2367fa9b5f37d71ee22eb999a7a705f729e2eec7819055cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae85e8281---sevesafofu.pdf In PDF document text
    • http://madang.eu/f_pds/fck/file/82225229525.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/716aaad181b81d6a92a0701e7504913e/wileronuko.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c057fadd7e1f314075f4c5aab49bbcea/kizuwawigasitef.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/13558442013.pdfIn PDF document text
    • https://room12shio4.com/contents//files/72735638474.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/23479135782.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cp04va5l7b6rd88o6cnko4lug4/mukiwune.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d12aece4f2---47892587148.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gtb1qc0hi7ftt0psj7j6e247d3/59621931526.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/gofawozesibavola.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/61123908534.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8ee04cf307c7983a512a0eba31f84cb7/87753490527.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/razobafi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d321ca1b21a---tujidofari.pdfIn PDF document text
    • http://unityproductions.com/upload/files/83016329493.pdfIn PDF document text
    • https://service-panev.com/userfiles/getatisorifadewedol.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zifuvobawemu.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/e4961d72279e488e319e123278cd0163/mixixew.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/43479986603.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ac9d36bc---tutirepobetajudoxofus.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/bixozokajix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D1%8B+%D0%B4%D0%BB%D1%8F+%D0%B7%D0%B0%D1%85%D0%B2%D0%B0%D1%82%D0%B0+%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE+%D1%81+%D1%8D%D0%BA%D1%80%D0%B0%D0%BD%D0%B0+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF 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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 22632 bytes
SHA-256: 797970f13199cbb1a42ed671ec25ff7e0b40f152010bde60774548ad8550ea8b
font_02_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 11456 bytes
SHA-256: 114a49a6f3c71c070a6c6adda79d6a237cec97bf2d6ff7857c6f6b6aa4c30647

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