Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bbdd656fdb4948…

MALICIOUS

PDF

87.5 KB Created: 2021-08-10 03:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c4753c9b22fe4719e913a973b90c98d SHA-1: 015664f1a28156bd529dbb2a5d5b4409335ed744 SHA-256: b5bbdd656fdb4948a060cb56a6230b505c33eb87e1da1165a27463a77128ca91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, likely to obscure the final destination and evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/b14541c17e03f4a143c9e9db76db5a30/xikeviwogituguxidoboj.pdf In PDF document text
    • http://mabo-meccanica.eu/userfiles/files/62521606142.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0d478de2---69091243691.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/modefufu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e480c77702---sedinovimawuxupowisuvux.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/nerafututufa.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/51794161634.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/balotinudamedija.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/31703406006.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/61160521582.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/sasosabonet.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a5389c1ad---50906780918.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jusigiloxorobunu.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/medaliwiwegetijuture.pdfIn PDF document text
    • https://zhansq.cn/upload/file/6903250023.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160f15b8c6cf40---tisezoromodinovebibinos.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8bb490450e86097cb4d9bdfc20742da1/vesupujopezujokodezodiwis.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vevomepemixaxufulo.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/88365257053.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a09f7c27c---dekinazovo.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/joditedabo.pdfIn PDF document text
    • https://ckmandarin.com/uploads/64691533537.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6798b883---20088635220.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/a6ic4n6d50qe8n747n0netgm77/95591765188.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610993b3493fe---11451284903.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747a4035db0---60525050689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=jimikki+kammal+mp3+song+free+download+isaiminiPDF 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_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 11084 bytes
SHA-256: 392ea6b29c9acdafd62323d30dfafafe328225c02634fc18975da6624c73d10c
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 17724 bytes
SHA-256: 7f51fd381b7340a30241727cf3b9fcfa9a27def406a768f320597c750aec4c55
font_02_sfnt_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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