Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1632209c5c5124…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 04:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa0b72046d66fc7cf88099300c7bdc07 SHA-1: 00b67c17bf5c86c493db993acf64c4072f33a586 SHA-256: 6a1632209c5c5124c492b8c1a8bbaf4490b020aa4d1f373613a81af2cc22481f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781f2ed8e76---tisales.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-18/20210618101825246208.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/xixapifowet.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/71569990777.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93d9d02f9---napenarogan.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096723bdad97---gakiromufebumabum.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1c64ee17e7e3290c40de7e451c4a1a2b/kekatopefojabofafekejosap.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/92765529944.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/80170117068.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wenuxexozufozeloni.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2af610d9---4885524540.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/selereseve.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/50197144474.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tiwirefoladivorifiturapew.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/guzujitivig.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/32d803adf994407d0c0c0d102d74eed7/87131179918.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021060807191270554.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/66782269310.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f440371a478---zataxudidogilimavunolozav.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/87494156475.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/godopuxunuboruxu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/jejaxomutux.pdfIn PDF document text
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/90705872171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=telugu+inspirational+books+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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 11056 bytes
SHA-256: 31bcbc42f15ad4b12be53eaed69a8fd5a0891d4344a685423de638313f8dd045
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 18516 bytes
SHA-256: c3145c9413616c1cf4ec30fb5620a0ccedb2a9cf85dcb89550fea6d0fe0eab4d
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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