Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5bd6d0bec7d0c1…

MALICIOUS

PDF

95.5 KB Created: 2021-08-09 12:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: aabca018d28e64c7d6b1e334fe9224d1 SHA-1: 0fcf63e210b2e58ef6e11ed43c009335fe4b6093 SHA-256: 5b5bd6d0bec7d0c1a1fdd02b8de0312094f4ef53fd670f2f6c576e4454f799ce
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The file contains numerous links pointing to compromised websites, suggesting a phishing or content-luring campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates the PDF is part of a link farm designed to distribute malicious content through compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d541f827eb---mikefalositivalewoj.pdf In PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/83o73ckuq1ih32tq5cr5m1amhq/kafujigosijosax.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3130e063---65682630964.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/19069995695.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48b1c86b47bf79e0e5b69e1b750fb4fc/wijuzikefegititaxol.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/98276714207.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b19df069---gunugowanorawozumoguxalul.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f34c10c0c4f2ad9b8206feb84830694d/xonilagubekepurat.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kifazirorafelimo.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/vudebuxaj.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3c9235f6---30202358836.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/39661567012.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/sekiwose.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/61859159102.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9ubrg6s4j7sou6s5gafcheehj1/pevogulawujawalolubema.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/visujoraliverixuzima.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d1493e3c5e5e1b5307273a5bcc7ed472/disuvebofike.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbd0204fd---gujozowetuzezas.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/badivozusurorak.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0acb2f6e402aa6b156655df0e72787bb/65315453069.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e983c7f12d---42334235142.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52fa1276c---73376488274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=d%E1%BB%8Bch+c%E1%BA%A3+file+pdf+sang+ti%E1%BA%BFng+vi%E1%BB%87tPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 30240 bytes
SHA-256: 8c2bf394050f35bc220c313bcc7beea7d1920b102d396c88653ed08f05194985
font_01_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 11504 bytes
SHA-256: 46333c9c0242efdb32a1cf05b77f40f9dca855dd8124514c821b2d62993e6170
font_02_sfnt_off00013ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15703 16336 bytes
SHA-256: adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa

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