Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d287ebf0ed09c7…

MALICIOUS

PDF

76.2 KB Created: 2021-04-29 00:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3b3910a32bc9d45e09d1bc8b5fcb6ab1 SHA-1: 9c03edf1cf26ce94723c628ab80b3739f66d33e8 SHA-256: a9d287ebf0ed09c77eddee6a84c0bf7c7b348f082e7943c9176b7360ac7efc26
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8175

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://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0a380e62b2801461da33b76195421af1/77171653247.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/081ad0a97f7476f90f83636e37204339/81497871335.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/738f3bfc6dd2e4ffa82a4e9f0b8c4dff/72915644642.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/48143c5adf58ccb5515b9947ef98fc75/8790606029.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6m6qa0oqt476vm790rvbtgb1k0/59784867795.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839590a24fd---dudezizus.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4f11b63eff305c88d2c7a2cc569f9d56/fodegolomezigurixojoxoboz.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e26c1650671893a108625fff9b806760/witibowamulovun.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4768v8brp5sm7prm0n8nchgh45/20913997246.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64f6978518c573bd2635bedf2ca2848a/gukamikalav.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e745c2ee---zegulaborajazimogenisu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846dfcb6b70---kozalipov.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7d543016cfe3bad6ed7db57a75fee168/93523090905.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084f63574ae4---60898700006.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcce27c90a---vebizemebux.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/PmAiG5ZyT-k/uplcv?utm_term=manualidades+de+halloween+con+cartulinaPDF 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_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5124 bytes
SHA-256: cfb179bd08487c1bee034335baa3a106486c508957ac405c0d5721b474430161
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 11908 bytes
SHA-256: 1e4dd2b6f6d940dff94299d08e5fa93345192d2828ae09236e38aef8ce190b5b

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