Malicious PDF — malware analysis report

Static analysis result for SHA-256 672a05cb71bbaec8…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 01:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88a6d930f3105ce653340e6dc663e09c SHA-1: a241ccc9321a2324199ee410e3d52adec7489d24 SHA-256: 672a05cb71bbaec800a0c9325f3f9ab277719d4fb1379b9019b12e56606e5eac
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. It functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nhatngudongkinh.com/upload/ckupload/files/zasovukifilozezobejijuju.pdf In PDF document text
    • http://esrafisek.com/images_upload/files/waped.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611efead1a0cb---31773979715.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/876184fa037b9d654b46406474f61d60/miserevamikapebupotopaw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90ca83ca6---47944642110.pdfIn PDF document text
    • https://emmaushuis.org/pages/16046271215.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/3667313005.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4cq7o8f6h03j0odrkso9sivvmd/jofokip.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/27996121658.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9d9126460fe98ab5237c2ba9262ff8f7/moxadekagofolagurisok.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ef7b8112f2c16900109304017251024c/91614632553.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/1965393828.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/bijiwamuvale.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/8765956825.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/fejebutazev.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/252d3e3a89fd67a23f9f850dc77d2b3d/14116933122.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210817051306_loe9b8.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/f57466719ef892c864510b054209d6d9/96178710339.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80064596099.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/lukaxofaleviwefodasov.pdfIn PDF document text
    • http://hrudolf.com/userfiles/gobufatobimon.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/fae69b60ae53854294b728c6208264b0/zizidesurilu.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f334514d8b---82474771273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=age+of+reason+and+enlightenmentPDF 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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 10780 bytes
SHA-256: 5dcd09542ab8c4aef41fda0c51cfe2ca150df515cf946f681b924bd2664fa8bb
font_01_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 19328 bytes
SHA-256: 10f86d0bc380b871f5660d8e7d87fdb6d71f67134ced2f48b5e811fdc3b993a4
font_02_sfnt_off00012fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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