Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8bdf58f9459769…

MALICIOUS

PDF

69.7 KB Created: 2021-09-21 17:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8a12a224b83d1414ec9880ae9c0dffd SHA-1: a43b384d64cd63b075109e9ca9c421289d8d1c16 SHA-256: 7f8bdf58f9459769157174b7b946cbb3ead3c8dd90ccf36de4f1b9ae6f25a308
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed96c567f---ludoxoxelozomitofilo.pdf In PDF document text
    • http://learnazia.com/fck/imagesfile/daxuxazu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/duwevinagol.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/70611991454.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/33413114678.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dijoruvanomarevew.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406ebe67d36---rurokimilovazile.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613195dbcc16c---41014260803.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/xoxowugoso.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109050451234077.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/pukemo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613387ba83328---12009752601.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b41793d8d---xilem.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/24fabb82a4a56f7668542712e40185d9/supesepom.pdfIn PDF document text
    • http://agmapure.com/upload/files/wewena.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/25977827371.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/vesixipiniwo.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/zogafaj.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614384840959b---86071724071.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/48228556823.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/wopafimuwikivesalom.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/peradolapawosazalejep.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/17287150748.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/43584297701.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xamom.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fusuwigiwofutativinexawoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=4v4+car+soccerPDF 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_off0000b67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67F 14516 bytes
SHA-256: 6b560193defe42690beb3e2bf003319c6d8ffa8397451938ef60006c4449870a
font_01_sfnt_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 9932 bytes
SHA-256: 2f166efcbbcb98116821c1bb604a5ad7c2b2b6122ec10271d9fb8da517845856