Malicious PDF — malware analysis report

Static analysis result for SHA-256 308ced90139ad99b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 06:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 284ec4acd8f516e5301ae14f61a72a26 SHA-1: 920b4e6a9e2eea1f937ecddef06ff64679a5cfaa SHA-256: 308ced90139ad99b7576cadfed79eee2d73a991ecbd78b700cef8aec8e633877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://krisoc.ru/uplcv?utm_term=product+mix+pricing+strategies+ppt PDF link annotation
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16107160e6295e---futuvubopudeniji.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/68425615485.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/97475941042.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/18885099340.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/jiginoru.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/62402233223.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/logewis.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kajipida.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/4vor04adl1b72kdiqos601ovpp/fagarezikitoruwuluzil.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f21ee9625---rafaxofajowevogiterukesi.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/bb7b00aef8412144c92ed9ee50077cc6/labem.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080713504518.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831eaa4abdd---baxobanojotavipusujelanis.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/39732398160c71c6461a9e.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/wixasenawalatim.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xazerazefibezugapir.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09cefc5cd9---jofobuzik.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/7914044201.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/bubonuteluz.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/jufonedigowutagurifit.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/78092539333.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/528f6d682e3f3ec537311056e94ee5cd/lulezinekakewe.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/89601575354.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3e03a440---12777100002.pdfIn PDF document text
    • https://elektrona.cz/files/file/jademiwex.pdfIn PDF document text
    • 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_off0000ba58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA58 15336 bytes
SHA-256: e96a2b454dfb23b35581753ab84df6d2677720d793955d041cc249b74c191a2f
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 11016 bytes
SHA-256: c18f6a7069ee10444fa2925cc12d3f02f1c531d6a83413d64e6940836f51b031
font_02_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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