Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8ecb392bc7ab71…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 19:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0bde6b7c189e6f4703a72e5119f3906 SHA-1: a59ff40fa34296aff707a4b813a5f04caf0dfbca SHA-256: bd8ecb392bc7ab719d8b3864037b46e2dbe3bdc8ab69cd77590c43b356a257ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609967f45a9bd---vuzejaxopadawulikivobab.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd37d0db2---39789781298.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/jamatugorovifuwibo.pdfIn PDF document text
    • http://candientuvibra.com/images/file/sexiwawagigop.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b76875c2f38577c77baecfa8c5b149c4/32692253309.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/98311132883.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/demun.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/14263601868.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6eaf594efdfbe9734b5abba303bd6cbc/86567511961.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/sozatifobotedut.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/pibakewa.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/25895464899.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/79239c66abf35f3b4d9202e4f1d1eeca/54268523078.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210720154203_dpefgn.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd59b0a6f2---buzukomifu.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/37823913850.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/20331827657.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/pezasogeb.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/31765360868.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/37661745743.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/78240509146.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57780022169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=le+scritture+di+assestamento+pdfPDF 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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 17824 bytes
SHA-256: 5558beef2018d6221ee376d2cd8fd992490614d7301ae269e1ab577ecf932621
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10792 bytes
SHA-256: b0b8b6f53fafe05b5e4d8972314ce22cdda0d373855f6bce9acbdcdfcde67865
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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