Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2fc56365c446a2…

MALICIOUS

PDF

91.2 KB Created: 2021-08-04 06:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5b987cb41e5f9fd0cb4de27346de915 SHA-1: 46a997a853a96a829652f17b46e73afd4e69c67c SHA-256: 0a2fc56365c446a2961b2c903aba86f88a6a7b2342490a541828ed944cf814ae
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=do+taking+cara+babies+courses+expire PDF link annotation
    • https://powermailer.in/userfiles/file/85590003944.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/sabopixutawotilodimoka.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/068je37mda8b85hq5vqmpqf1nk/7764408018.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/54718338027.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/70834184248.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f149e129df---49945614992.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/wobizumulexagakarabeku.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hcj5ogvape91a0k0opf4qj0b05/76221754625.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/23633760276.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c26a3a7181f---jipuluz.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/52633462547.pdfIn PDF document text
    • https://andana.us/files/files/75613681271.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/pikanuwulotulipotukotixuk.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/tewolisofiba.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b420ed752fd---logusilon.pdfIn PDF document text
    • http://axwelindia.com/uploads/zifanow.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b63062b9890---kuvituve.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160798e44dde7b---18932283393.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/nuziremitegosanufomopajaw.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0d777ab8---rejiwisoxejonozinirujade.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/3644586656.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/31729411753.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d9fecd16c---38529990135.pdfIn PDF document text
    • 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_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 17124 bytes
SHA-256: 523c9146f3d5cb45d99fa56c7b78a7059198eee5efaba2298d422bc83612b061
font_01_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 10940 bytes
SHA-256: 65d6cf5151f97cf231064dd5dca94ccf7856c102a8eda265fd7d2747a57688c3
font_02_sfnt_off000143f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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