Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdfbd4affd425fb…

MALICIOUS

PDF

58.6 KB Created: 2021-05-17 11:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b9bd3b0e7dd466be635c9c33895cef SHA-1: 075a71d5b17a46c03cd05a258937d93a2d8b7fcb SHA-256: cbdfbd4affd425fb79be997da4ad659e1ea686a3d36d9a2b733ba356f95f9848
154 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to potentially compromised WordPress sites, suggesting it's part of a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure for a Sony RX100M5A help guide, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e1b7781d---bikadakuxasasogapoladow.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/15f8ce34eaebea7a6b6b2d8b3893b4de/pokobevopokopur.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/vuzulo.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7ca19b5f---juzukiropapumikunobovo.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9st2ofqu23jvlbbv71olt0g1n6/fafabediga.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2hgshmqrqdps466mthdmouf4qo/80060985899.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708fef475a9---rowudo.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820dc0d2aac---35445653488.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160885262bfdeb---fogifasuwarifog.pdf
    • https://topclassgreenery.nl/images/file/93019574733.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a61b6d0294b5ef7021471a8974c0cdae/65095623830.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/395d91fe191f9b7a270e36612b37db6e/vaxixakazefibisufawofop.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8aae6139---92618828536.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a336dab13---tixanusemesatu.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bc925fab8f951823268e37e290ebe0ec/6928805064.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/837394c958bcffafda8f4594e3a5a0ca/fumoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dsc-+rx100m5a+help+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc59.bin
9c91eec45e94994f7c884262b8d8fb62967da6913a63d9e5c5ab69cfe1afc03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 5904 bytes

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