Malicious PDF — malware analysis report

Static analysis result for SHA-256 157b1b37a3890b23…

MALICIOUS

PDF

92.1 KB Created: 2021-08-11 18:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5335bbbe0074477b627ef9349ab0b15 SHA-1: 304845b8be4cc07a65a64fd6a34c8ce1df91756e SHA-256: 157b1b37a3890b230929efa0a264ba4114148bef0210f6ae374400eb3bfb7d42
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination and evade detection. The embedded URLs suggest an attempt to lure users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087e70695e44---pesawekofedow.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608757b57c951---lasugikofupuvudilel.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0tuqp48do95homr24tk2iefh5h/jinebejig.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xibawazelewubumevitururuf.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/82044160214.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/49624759360.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/73157289202.pdfIn PDF document text
    • http://aquatherm-graz.at/files/71697320554.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/ferukejebafu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/66933078184.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/06d5f6ba38ac80614a40b69b97685abf/65878180258.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/toloj.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/7500cabbeae108009e4c59a2852c9391/84063087056.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/98033240052.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-28/20210628111306545441.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/wajifofulizetakosemu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b36ac73a24239b84d01cd3110afe1a93/muvubidutodomelepawizib.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160872ccef2b13---36807258539.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607853cfea45e---48086711714.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b591a761ec7---remavuwegogifuruxo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cb5d33e88ecf65aa7b2c920185d11359/zesigobuxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=plantronics+m70+bluetooth+headset+user+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_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 17524 bytes
SHA-256: 150b95e91ecd20bf9c8323769aad0d02877e87b9925d386a065fb0d45f22e051
font_01_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001484d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484D 11048 bytes
SHA-256: 47627df683380f419429e8477c72b9bcbaa9b74e3c4a57af817e69056653df7e

Open this report in the interactive analyzer, or submit your own file for analysis.