Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d7da25a4acf4a7…

MALICIOUS

PDF

64.0 KB Created: 2021-05-29 00:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc0d8b3b5fcda91982b6c273972d640 SHA-1: f86e35b320f63916e58bcfbc9651687ac8b13644 SHA-256: d3d7da25a4acf4a7c7b4a2fdfb6b07ec456300ad5c68872f0bc33934bcb4fc97
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a51c65d33baa3a60d4efbd933994a4a5/zezitaz.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/26ppddmk9157j9fjfh0g12f1m3/bemazominaxezivamivo.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf26764d4---zifuz.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9cfe36ee---pabudapitebawofo.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087dc11402---59542026097.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829d8e7198---45138199530.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8h0glrdemrbfgtp3cq9pbem522/68312864470.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8cf129494---xikiligim.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160723b27cc785---45615086404.pdf
    • https://tkquiz.com/userfiles/file/58003642096.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081441086aba---94529332661.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d87d5858a---35645567232.pdf
    • https://aplusadvance.com/naver_editor/data/file/mevalipajusonafonamiwafun.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c797bb076---23228648404.pdf
    • https://fanaf.com/article_ressources/file/26556216211.pdf
    • http://ns.adobe.co
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dbeaver+download+driver+manually
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f4.bin
fb104b9dab85c6b695780ab84ef7bbae290b07ca2634ef880bfe5e0ad0059d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F4 5184 bytes
font_01_sfnt_off0000d49f.bin
fdc1f5e87c2b69e9d9e15770cf0e9152080d28c2cfc1206a643b3800c06b5d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 9744 bytes

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