Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47e8f1300ccf86f…

MALICIOUS

PDF

84.5 KB Created: 2021-07-17 23:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1ba89442644e5e67f121ec91ebf4d9a9 SHA-1: 36d03391552c1cf4840c15e58792572c2486eabd SHA-256: c47e8f1300ccf86f0bdac91311d9df96d448feecdad62c5c88c8cd8ea966d012
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//58659098669.pdf In PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/00f4a2dfe66d3f9eaabfe13a59fa32ef/99688619888.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/likolugub.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/tasedonuwa.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971c2e09dc9---zidinobimikij.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0c7a3378ec47dc64391333de37cf38ef/pivirikoritapupifu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea226ad2d6---tawogaxukofilozafas.pdfIn PDF document text
    • http://skupka54.ru/upload/m/65564070335.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/betodagikozika.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/7608003687.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8783090f0f7116ee600f08f1e68e3faf/48131407205.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3da3396d3---47701636137.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a823ff03f8---bisozexiripepegoke.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66138494261.pdfIn PDF document text
    • http://feast.to/upd_file/75825286399.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/56892888381.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160924d4ca5824---leveletevafadiz.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/natanokebo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/li1qi0jvms3kb40mem3vufjcb6/18395142553.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afe57f29920---nujirosumex.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/sawuputozosumokefexexufu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c53378b56197d3cdbbf66ac87d898eef/40000148652.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/aaafb33a4866ce98c238070d0d047d33/30600606097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=12+edt+to+gmtPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 9996 bytes
SHA-256: 7767daed238528144bea335b536d59c033278810a42fbc9cb7cb5a87e2d8b087
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 17560 bytes
SHA-256: cbbf10430d3a58c7d4fd58d339117dbb227562a3b463f5cee61583f480efb78b

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