Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19f8df913b147a4…

MALICIOUS

PDF

59.9 KB Created: 2021-05-21 05:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49e53b252bd0f6f92f247c6a2926a406 SHA-1: 90dc21457921bd5074b8511ca47d00e8e25d0741 SHA-256: f19f8df913b147a4566e87d48c5d7239f2d4c35f254b301cca30e7d3417e9533
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. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for SEO manipulation or to distribute malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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://garglob.ru/uplcv?utm_term=examen+del+capitulo+5b+realidades+2+answers
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jqbc8a0cmv1lt8ro1215816q68/wixutekamapavefa.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ae528b563f841f56ee0cffc60ef18395/89930374435.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9804c5710---20212702905.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608616a327a1d---9091650831.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9cf86fe64e6b03d394fcf8410155516c/kajitiranedisalozorotod.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0e1pqqkdomtvjrdsjp2ienns14/52879946382.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67d14914d---1047032143.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3bam5a97lloc5h6e399nunnars/47663309918.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/sibokalugarumav.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b75e758bd---27083575399.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e7c84b43---jurowoxifisidaxidijorig.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8914c586---65145021601.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh6rm6uc9glkkoji1bhtbmtoo4/jurezesotudafusazuxokoxa.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89a9288cc---nolup.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d13103f312---68603836665.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079b38b19bec---fanukixivusijexo.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f7470a1f77a136f99b72af69f9083bf3/99729662023.pdf
    • https://asset-books.com/userfiles/file/69759092116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c248.bin
2b5279002fd005f567e0ea6aa99b42ef271b07f3005a45b33cd5c6f8f72d4c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 5732 bytes

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