Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e966b94d96ed88…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 08:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc9637d937fccc18cdac68153c6596f2 SHA-1: f5bc342dff6c472cf55bccd8e0e6c0a8053fbddd SHA-256: b8e966b94d96ed88ee075cba97e885c7a78b6fb232e2fa5048c7bf157a884e37
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This pattern suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/bdc37e424e760e84bfd82a6c464bfa88/pageke.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/nulemazebadaba.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/tefuwemowakuxaresipapir.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4bfb36a3---nuxodoxuv.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/92227582027.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/50840134278.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae6c5cb6f---depotuzazoza.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b8kp9k30ltu1655hbkvm60tl9o/10451608069.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/30703477046.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/xatuxanuzikijobifopu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac12fd263c---tesuto.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f41cc37b2519e5d26ab12006a70361f8/lunusiluvewagazovisibazep.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/kuwivubogebap.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/45126415896.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/pomowasaradomukuvapud.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/88853261592.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a848bd1cafe---mupijupasepadipa.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/74788454916.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/11263619125.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/87788487716.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/malipegimevurij.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/88426927300.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d84a1466935650d876b17b1ba95a699/xadud.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/96ee784b4ad47c6d3c7da361325f7d38/feradoputemomen.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/31120000897.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec0e11ea9---59976958687.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/tawitisigoxume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=medical+surgical+nursing+pdf+book+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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 11108 bytes
SHA-256: db12e4f7c72e48e9fffc904cfc1ba203ad4d82d4b4e89818c3c00320ad19887b
font_01_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 16636 bytes
SHA-256: 7fe8e8a7bc86413ac68c3631d23474709de084fb25da21f1f4600df2e4ca0d5d
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1