Malicious PDF — malware analysis report

Static analysis result for SHA-256 b057e0092936052a…

MALICIOUS

PDF

85.0 KB Created: 2021-08-30 04:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d4742a0ce8f0581322a25dce0bd4250c SHA-1: 04145b629a3b1bfe9f664dc92c5c37f1b133c123 SHA-256: b057e0092936052a31b092aeda3c50ed24eb1e7741d5f94ba7f47e31ce76d6d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other potentially malicious domains, suggesting it acts as a link farm to distribute further malware or conduct phishing. The PDF structure itself is also noted as potentially being a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=p+block+elements+class+12+important+questions+with+answers+pdf PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d619b5e89ccee6c680f3c3b4d21c00c1/jivogobemigazomonebuga.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/63006731608.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611adcf206212---sibojatanozoda.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11fd05846---temiz.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210811_36174A150081A12A.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/77494670694.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c80a4d12835e079356681f4408033a7c/19229998968.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc153489e9f---65671007317.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/sivevuxizo.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/73568759961.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/jopidexaduvugejavenomaji.pdfIn PDF document text
    • http://chinalabware.es/d/files/67018690180.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20b844c92---duwutuvuwitom.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/veguluguvizusafif.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b5b08798---24093020695.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610a377d68a1f---sadijemefaxemupuzurowetu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e328e48a---66387881834.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/datez.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee7f73740---kodaguxijupusabaji.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/degivojowutupekusuzanujil.pdfIn PDF document text
    • https://scalper.ir/data/files/file/76192423287.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/3896484770.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/16819440820.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc8eed8b2---lusozigimeva.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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 11620 bytes
SHA-256: 99bd43b6bd90f14f2dbf6ddbe8d074e7b4da29330944c84eefa9f7556456719b
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 18072 bytes
SHA-256: 14ba49ef41f940bcd95f28c69bd42465597600142cf4f4b84401cb7fb0f4bf4d
font_02_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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