Malicious PDF — malware analysis report

Static analysis result for SHA-256 385f47bae278da0b…

MALICIOUS

PDF

68.1 KB Created: 2021-05-20 15:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbeaa63e186008d5bc2885430f70ebd0 SHA-1: a3e3594aedd883193ed80ed26a9cdb249b3d9c9e SHA-256: 385f47bae278da0bd5568f85793d24493b079677819ff19e385c451940fbdace
94 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, specifically targeting their file upload functionalities. These links are presented under the guise of a cheerleading guide, suggesting a social engineering lure to trick users into downloading further malicious content. The ML classifier also flagged this PDF as malicious, reinforcing the assessment of its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8380

Heuristics 4

  • 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.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae35c0a3d---39560818050.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4b3423e880163d688a72ffade1437685/naravopupujotiperedi.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d42224c9eb5e9d5010273813112e6fa8/72318335595.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880060cb902---93986132320.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f6e6dc4b---zadeloluwesedipolufusit.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3835702cd0---fezeza.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/dbtql84m9ci2s22c4589080ob4/jinalidubijinaza.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ed285e7af3271fdd83e5edfd676bed22/18363277427.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/45f7a6ff2792ed4af66c52062e36e280/degadom.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b1597a53---33032032066.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68d44dbe2---74577328576.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846af146433---fezufujevexaguse.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8d9c75b87728c28c7e8171f8029ee6a7/22492271069.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bdae3b85f---wozutirate.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n0d65cf3ks0vntsvmbmt87h7k0/1400448271.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd698836d0---3640223139.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608894aa7c96c---widanunevo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/53917595a9ab56670062636d0211044b/32580905296.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39c67abd1---39792268542.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5f4de0fa968f58457c10b3669f1dcba8/13965406284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+do+a+toe+touch+cheer
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed2.bin
bff049888e20d2c529c43add987c0ef8fa52e2715adb4e251283db034e9944d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 4596 bytes

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