Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1c44799b997e38…

MALICIOUS

PDF

80.9 KB Created: 2021-07-23 01:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 913d8a1795fe5ad192f2cfdcfd633a76 SHA-1: 433811390db33f9f4fda7206e5c321c9adee6b16 SHA-256: 7f1c44799b997e381f3aecd6a86ac373d3a2e9f96e5d8e2364fe76648bfcd413
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wietsevoermans.nl/ckfinder/userfiles/files/28865004885.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d79e4e264---pomeputupuzefer.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/tubuwokebatizigatexemul.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/04259b2b82218911c2124ba5483ccc9a/94328422877.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/23303426344.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bezodepoxofizupegugid.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f540b1b95b39a299e7bbdff0b1e5d938/65953136821.pdfIn PDF document text
    • http://compsult.net/userfiles/file/lowesirumekuxu.pdfIn PDF document text
    • https://mmszke.hu/files/file/61685231403.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/19258974736.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050500442573499.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/sibujoxa.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8dd6fc657da9f87475d18579d7c0cfc/53995488909.pdfIn PDF document text
    • http://fygl.net/uploads/file/091941286279.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d9b1c3529c207d2d957aad8593c89cc8/bokunopaxomefexef.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078decfcb450---xadowolemiwanufom.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a024bb30035---41740294009.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820171c040e---ropazoxibidejufanuwopar.pdfIn PDF document text
    • http://kaies.net/upfiles/210710150257059671pu5a9s.pdfIn PDF document text
    • https://kawanmto.net/contents//files/48878352149.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/wepemipaviduvoxor.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3705a85f---19481023371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=square+root+of+x+simplifiedPDF 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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 10980 bytes
SHA-256: a9f693016b1e77d5cba431757a88f8504f1933008ee8d97c6c7045a53c13c4fd
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 17048 bytes
SHA-256: b39cbdd3fa3f1bc1631f1b07c5e0eaba05852cc741b88bef72367800945d7b7f
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.