Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ca6247d88e7d63…

MALICIOUS

PDF

64.0 KB Created: 2021-05-31 16:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce645b0f8f070052bd0d0afa870339b SHA-1: fd08cc6b613f6c528a053b724f4c7a8d421a5eec SHA-256: 23ca6247d88e7d631d7060aef002014c4eeae16c55c6921038111968b801386a
154 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to 'Jre 1.8 download 64 bit mac', suggesting a lure to download software. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as a legitimate software update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/37779d7add4ac4886fe1bbabba0a4f16/95766454335.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/968b0e44b2ebb6f0d17200c7cafd7a1a/taxosuxegitemumiras.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e83102ec---75760752756.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f25ea8950fa9aa18ec9092ef1471215d/36919153287.pdf
    • http://mikailang.net/userfiles/file/20210502003801_1374618276.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a11e5bc46a49ea709ed920515a2c9b40/biwabi.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753272bf846---pisunogamafudajobijema.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160793b43984da---44620981963.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/0ce4c59b9324dce6c2ebd2cb329cd38c/70390922500.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe3d99f47---legugewawowumor.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de3a04a01---fulurafesaxov.pdf
    • http://learnazia.com/fck/imagesfile/danogunajilolel.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c42267d1a---15045335562.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ba417586---gafetabudigi.pdf
    • http://booklandbooks.com/userfiles/file/jilelibot.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1f18da282805fbe944d1277c9cfc930d/30873315806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jre+1.8+download+64+bit+mac
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin
1608172660deac864e274c26fa7c2a7b3f297d5155e7024ecb706d2b373fc669		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5648 bytes

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