Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b209ba1ced62c98…

MALICIOUS

PDF

70.6 KB Created: 2021-04-30 09:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2920d71820c93bfd066f75c65b41a7c1 SHA-1: f5da4bce048ed2588a1a0fb72b61429ea516355b SHA-256: 3b209ba1ced62c981b5d7552f02f27802ac8ab36980226762337030e522f6eda
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, directing users to multiple compromised WordPress upload storage locations. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9430

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 https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fae64e76b0ddfe15ddbc36b9433dbe2c/nikesusunedikukuvukajax.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9779835c9---34602388818.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tkhdq0nsdsht876cftd70j9vpb/zozeregufilamutut.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f44901609---wamixonizajerubof.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/suwedejavipogofuwexotado.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2bf07a2561d4a99c0995ae0ab6bc5ca5/gekada.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8591a6ff---8585410997.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/40a079aa8ec3a9ed2a5f7362946909c0/munek.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0135be1aa---zaxewo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a26efa2cc29b7c5051513a4d8ce4ee16/fuxowizinibu.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4637f3d5---93932495880.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6b4787a7---nopixamewik.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607633cdd7add---81241742857.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607278cd9fc17---41159742967.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a3480d8d523e7c7adf70431360be97ea/nerisabokunomojala.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/Om9ozkHLxGw/uplcv?utm_term=bfg+ko2+sizes+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 5168 bytes
SHA-256: c90fc1b798a280a429c8b4cfa149f713d480f5df798388d6bb05c1e427cfacc5
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 10544 bytes
SHA-256: c5a78b977e067f9fa6d3ab9b175e29ddcca3e8e57dc9802189b6ef3a58bf5bd6

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