Malicious PDF — malware analysis report

Static analysis result for SHA-256 413af6b738e2690b…

MALICIOUS

PDF

93.7 KB Created: 2021-06-19 03:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 036b45f3a8b63f48637eefa89130be52 SHA-1: 9ce2b481bd31e650a33501e53f5ea8d4af236ac6 SHA-256: 413af6b738e2690b3b3cb80afd234f0649f8d07bf08aaf09260512b289c08c10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The presence of multiple links to compromised WordPress uploads is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9564

Heuristics 5

  • 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
  • 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 http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983e4a152a2---73331613526.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/vilomikomudufakitez.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac030eb813---jewazelujapolojorad.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dec17f55e---pigami.pdfIn PDF document text
    • https://abeess.com/userfiles/file/40160071269.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cda7735f5db3284b40f324784b80d2c6/16687875905.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/mlihcc0tgpjo1eetmke2l2cd6v/2120242532.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160788f2d3d8d7---niwapegutefadipo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81000f691b0674b016f338a8013cea9a/58194756956.pdfIn PDF document text
    • http://sterkrade.net/ckfinder/userfiles/files/vonok.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/suvogiwetukogozik.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/43057748704.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2b11c6cbd33f6b23aaf3a779fffd29a2/muzoze.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tan964ikrumhg2l1484881j9f4/zafogorunitivorawewelora.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622840248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mod+apk+chapters+interactivePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15704 5256 bytes
SHA-256: 3aa60d0d5875d0621634c8360778c7b047d61fb30da52167304b759d9ab5893f

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