Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76a56496da51079…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 08:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80a9fd9352259d3b47e439dc25f498b2 SHA-1: cf4d391232f026c91b3e1a8600e6aecdd5487bb6 SHA-256: e76a56496da5107983874806d9b3b585e00241a6f687658a12a1cdda527b56fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://aimic.com/userfiles/file/59728035148.pdf In PDF document text
    • http://orhs89reunion.com/clients/77823/File/godovevasebawup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a983d17ecfb---wakilikajovexegububeda.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/dakatumopusoweniduriwufut.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-17/20210617063616361329.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/4243611721.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089272995737---bepijizivatanosos.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/533489395.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/6493609717.pdfIn PDF document text
    • http://scsytech.com/upload/files/25703402972.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/47476138282.pdfIn PDF document text
    • https://okazionche.com/files/75211837902.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/sejui7k84d0thh0bdv73ohadu5/92738213567.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1627097930.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cade24a28f---baritezepeluxafi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7744beac4---gizarutafoxabovabifujidoj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/potarub.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/4043863539.pdfIn PDF document text
    • https://tavio.ru/files/file/xojojevufogizikaw.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87b6d8816---zosemigule.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/562ecad105e893446bbbd4f9d94b197a/watovefazoki.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/11942162121.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/t6vcj0vh0v4ncc8vi5dvimtp50/66505755242.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/rebunurizewatofudesevol.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7235ce6b9---46486917385.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a0830f58a---86664178206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2005+pontiac+sunfire+owner%27s+manualPDF 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_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 11140 bytes
SHA-256: 3cda9613e3f3a6461be6259b3f809dd4b21a5192e956824138935cb1b53b0215
font_02_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 17800 bytes
SHA-256: 18a7b71ef6c2b9412213b3e09c5d096a59bf313b7fa1874a3b75258aad1f7915