Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c03df2aa4677e0…

MALICIOUS

PDF

65.1 KB Created: 2021-06-17 02:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 483bca91bfe4461a871cf5c8aa07cced SHA-1: 5b51e7b275c80b3368ac7c2fe16d0b1581c4ba45 SHA-256: 59c03df2aa4677e0be3ec1f6369d9ad78580c7851d66521d92d1fe93af7bb854
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further indicate malicious intent. The document's structure as a link farm is a common tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://coretry.ru/uplcv?utm_term=goodbye+yellow+brick+road+piano PDF link annotation
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/83518828842.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075963232e78---lajiludebevewiluwo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b4d659babe4d8ced68a82f17995f5a5d/ruparib.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b752a7941148475777bde0a036eb7d7f/63845312746.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3973e94e9383a7dc76534d529660ee72/ziwuvuzeponorewedixu.pdfIn PDF document text
    • http://placc.info/up_image/nobodom.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb847d7df---30166737350.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc7f1edc1---15772822868.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/e4qqs0eq4mi5nber4c60e83men/28512762489.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3ba9691a---wevutimo.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3076c25187---96634377236.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/33b426ea42d3993d35d028efece93f2d/22644949384.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/7d269a3aca932d228855f2673d2d04b4/62837351250.pdfIn PDF document text
    • http://beateromer.com/bilder/file/silimebewexubijex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 5320 bytes
SHA-256: d508f29d98ed5a6531d7a81989c8e75d9bfca3085ef0065bb750d67cfcd36269

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