Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99668e7fa311628…

MALICIOUS

PDF

83.3 KB Created: 2021-08-21 01:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b93d7c17a23329257c3cf794349162e SHA-1: bf260e33eac5c99e675c545e3574b1a407a3fa3f SHA-256: d99668e7fa31162877a45a63de5e54aaab41d73a888e60e54c3601fb60b0321c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malicious redirection campaign. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://self119.net/upload/userfiles/2021/07/files/210718001520.pdf In PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/bexajapinapanebe.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/23563649081.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/16214638183.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/ritozodumefekobeg.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ktsn28f70m4eegal3g5f1qrus1/dureximojopedotanagij.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e0f28420bcac807f6b39f70bf17a6b94/marolofigojonid.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95492fdc9---18113082100.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/29701238756.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/faf5a805c7667a69a64d201101a4cf9a/71756496587.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16096067192e74---59772072704.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16084d54d7f662---zakudajugudatojuwudanofe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tutizari.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d91fcaadb40bb5ee9b948dd40fabdadf/50358196404.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8be15e380c1b0c8756505e8bf479cd95/81570549399.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/slu3fks1otl0hu77nqlqmg0d0o/piwoburejiw.pdfIn PDF document text
    • http://www.toptehnik.si/images/63868003935.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/27935395599.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e769f609e45f2638ab665f45607f44d5/fuxejujesosokisanitar.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/93006478362.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/59877f6e713c783ab1707934bc807d2a/rerabukopakogafezapo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/v9t29hvhg5ghmqp0v9mrcphtst/vexupefapijuza.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5f6db5a5bea129f9ca8f04d882f8cbc7/96967631096.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07bd9af92c---legowam.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084023cbd71d---jokalemegovobuxedolala.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/tivoreko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+million+dollar+mindset+sean+frimpong+pdfPDF 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_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10908 bytes
SHA-256: f10949468832b540f396809c0a7a5890ad55f40d1d466fc1fe43e8b0e0b30312
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 16224 bytes
SHA-256: e7883fe3046bf672faf3539183c7632264841e2b66a7ffc0f3f43ef014b0d2a1

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