Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8452536d208584e…

MALICIOUS

PDF

103.0 KB Created: 2021-09-04 06:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af75d70179a27c48afe5862d52c05473 SHA-1: 59b219dede7df0d4fb0c58646ddf82c462641479 SHA-256: b8452536d208584eac5f1f26e86439daf1ab10aa4aa4ec5a102aaabbfddfe755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69b096ab59---mibotaforusap.pdf In PDF document text
    • http://kpotplace.com/uploads/files/90958624032.pdfIn PDF document text
    • http://chongros.com/userData/board/file/korelewenoganowonex.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2a5a4c6---kutov.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fa36534449c7758ac55be7d591b5591b/57259330352.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/dufati.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7bd4c914192abc193acebf0519c3db65/81345077323.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/retugipujibugapeviri.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/2303018726.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/95221039879.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/tuborikijenuxugepivijafe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/46142675552.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608485ff0cd2a---12691714713.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0291a740a1aa57ebad6d392c80688e3f/xobod.pdfIn PDF document text
    • https://datajournonepal.org/files/gejajupuzojumoziwedule.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fcecd9fd---12551134950.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0ek8a38mgefvmq0k94sv1i41qe/83486019967.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2910fc36---78971734058.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/madakikuvo.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/4920251462.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/gadixepojesi.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/tawatibemaginezubake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kerala+house+plan+elevation+pdfPDF 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_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 10752 bytes
SHA-256: 0417c67303643001d4351345558cd29fa6e7b9ac39907ce8f88c463ff98724c0
font_01_sfnt_off00014068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001587a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587A 20764 bytes
SHA-256: c2d6cda61b428a504b78a64531e567a0894dc831ac5db4243c5de28cba695f09

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