Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac405154fce8ebb1…

MALICIOUS

PDF

67.9 KB Created: 2021-05-28 07:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 651e3f9837a3ae322a7a314f95f61371 SHA-1: d4f70233a82fc4f861192d41e9f94487507bdd59 SHA-256: ac405154fce8ebb1efaa25186c9d324868dba53544a16eae55f78b3765e89111
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to potentially compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF link farm heuristics suggests an attempt to leverage SEO or compromised sites for distribution.

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.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc94c82c5eaffccc824bb69a5f7bc3e6/bujonojivepefot.pdf
    • http://aquatrustfina.com/userfiles/file/93173966508.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/dd113d5cf4930e5b7c269323a8da90f0/dekowikigari.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c863a676---juwafanigewekuworaz.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5b9e8ce1946abbd44091dd49addcd7e0/nolusidomapupekewolotawa.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984767b8e31---15572635424.pdf
    • http://aldara-latinoamerica.com/userfiles/file/fumixaxe.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524045054910285.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98683fe0d---8600813329.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/u1oeg21pq2in8bo13afma30fq9/35776445421.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99efa740b---59891230894.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a7032547e24d927ecb71600f58a0c041/fusiguxizamorirati.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b195fb7e---54342496749.pdf
    • http://aelma.com/sites/default/userfiles/file/55585091749.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cfd480381---jilabadolutawexekato.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/342101390.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607567c56b902---4845168776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+fix+a+gate+that+has+dropped
    • 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_off0000cc45.bin
5d3d6f8ca225b802d495c736d37316c72950f43c8088c557e5b0e45ae5efa472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 5492 bytes
font_01_sfnt_off0000df14.bin
59652543a296605bf2374a33f9ebba78a9623eeb3b8b0782b3e853a86413736a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 10476 bytes

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