Malicious PDF — malware analysis report

Static analysis result for SHA-256 b553b847fd73115a…

MALICIOUS

PDF

83.7 KB Created: 2021-07-23 08:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84ee363bd90adc2aa1cb052b7f7a48f6 SHA-1: 0cc53da69b6d55f50a094e7a159307ddc90db815 SHA-256: b553b847fd73115adee6ed6d8f777d5ad276ef9cc5164f7bccec31dbae16f783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0dm3ee1tt6ftpgo91q6f4rf6a1/67495115402.pdf In PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/lubufude.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/sazaxikokelixabifag.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094de9d41b18---dovavubewoxawokedomub.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072621a25a0d---38809695558.pdfIn PDF document text
    • http://teresachild.com/upload/files/83000102560.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/43715044641.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/fidow.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d519c4940---54218476067.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/8182670378.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c8648a0e426447072b6802212226b653/wulufuweninet.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d74ad6f0---67084208739.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/m0huo8mku1a7mhc13chmdsq8e4/vivuwokitodabasevifotidos.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/dajinutajaxup.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xopukimaxugodeziwesuj.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050412003078.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0l3fo4kik5n8djccv7iccj4doi/38491927474.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/80256085510.pdfIn PDF document text
    • http://www.asslar.de/downloads/newejakedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bed+designs+catalogue+pdf+downloadPDF 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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 10936 bytes
SHA-256: 2a7ea9b7d3b8b2d90e71b53fa0cd38cdb6b4f41339a3088dfb86ebf0a03e8520
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 20736 bytes
SHA-256: 0a69b51382bacafd54ecc0b797d3dc10570e9ab283f45f8a649aa1017baa1480
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1