Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf176f0e5894c1d…

MALICIOUS

PDF

73.5 KB Created: 2021-06-24 18:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86145c2bb05b5233174fc46487fdb74f SHA-1: 85ff936925260e367de67d5835421b2a96ce6e59 SHA-256: 8cf176f0e5894c1db4f59e4fea1c965a22c1bc0e59b95f6899718a7252d2db91
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

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.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde54d9cd3---vegopesugof.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hueo1c7phs777ecs4qhl9famj1/18891978824.pdf
    • https://korovin.org/site/img_ufiles/supuwiredemilawexo.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2f85aeef---zulenazov.pdf
    • http://haithuanphat.com/uploads/files/87362779683.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f7558610efbc82778e697fbbfc95b124/mofewawomazuxik.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c04b3e9806cba6fef0546ef1f9b43705/gagegakutuxamiraxeluzuge.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qm6f6nd6er7hd4g2oq619svais/69622680799.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf0a6cb1b---malow.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/59dd73b7522bf8c77b68da7d17d65cfa/jinema.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebce2555b8---noxamilexezeturupodo.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160881a2736386---wolidavanodizawowom.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075488c2488e---33397356069.pdf
    • http://classicalgardenornaments.com/uplds/file/vededetamisugav.pdf
    • https://bititechnika.com/uploads/file/korosizifetubadaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+codex+seraphinianus+pdf+espa%25C3%25B1ol+descargar
    • 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://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c9.bin
e696f78c533625f38a346207a98de8407a44835ed59c754519fbf984c614743e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 5776 bytes
font_01_sfnt_off0000ec30.bin
830b5437ce93c26572f0c4680a0a456a6147a9b35dc649a04dea90555e085efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 13204 bytes

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