Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3d4d17fbf07721…

MALICIOUS

PDF

134.1 KB Created: 2021-06-21 04:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154ca2918186264bc0b4ee8a8a77c3dd SHA-1: c70744a81e31657d374df0c2d70cdddc7603d6b9 SHA-256: cf3d4d17fbf07721aff9686c313bf9987c11a2cea511e5bfd267f021e6b680e2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a security bypass instruction to disable antivirus, combined with embedded links to compromised CMS upload storage and disposable hosting, strongly suggests a phishing or malware delivery attempt. The document likely aims to lure the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://aelma.com/sites/default/userfiles/file/1418026315.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3ba92fb6---linas.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/57fc04f67b0f55bc79f1332554911484/birivefobukodujasi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81e92ef7863f311e3c20117ebf45a345/186597689.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a011f4eecd9---2790083690.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607735cc406ae---67799862079.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeb73433f---6992411520.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba63b929523---64032007234.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb5e3004a---doronenuze.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8143a9a758c30b4cd472e651d889e4b4/48810004989.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ae6e36866b6ecd2c36276d41a120e7eb/liradapogabekelazepegexuf.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b053526a92f3fef35c64b341604d5bc0/90306598396.pdf
    • http://biaikatolikus.hu/files/file/77082838898.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c9be15a0dbac89fac6d4b7c178faf1f5/mabibejuzutasokajezavuvut.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5c893520f3a5817bb0f069fd95c2e3e8/64081861159.pdf
    • http://zhengfutz.com/v15/Upload/file/20215262253274329.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/91f0c81ea66d3abdbab5e257c9ae473d/sebobusiwadozemomom.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b8e6a583d0356c9da34f5a2faab49c3e/mimekiwazikedevaguge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=afterbirth+plus+mods
    • 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_off0001d24c.bin
16bd956e82cfadd4b3fac29f61ff80a3102b34a4644dd59d6fe75d1a0d77de89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D24C 5200 bytes
font_01_sfnt_off0001e3ce.bin
77eb3a37f3301c9f8156947844a046be1d86c47fdde86cf2ade313eebc14abb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3CE 11788 bytes

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