Malicious PDF — malware analysis report

Static analysis result for SHA-256 2765e59ccb8ef196…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 04:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44414649b917de6236ff94deb0574f25 SHA-1: cbd6688c90f12fa313a9224f5fbcedb120bf0b29 SHA-256: 2765e59ccb8ef1963e2e608f71170d89187baf1f1282d0ad3e082ef190e1d39c
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters further indicate a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ce323b31b9afdff7beb449bbb144c470/13889183929.pdf In PDF document text
    • http://geobigoni.it/userfiles/files/guranirabemeravode.pdfIn PDF document text
    • http://czyxchem.com/upload/files/69250593861.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/babixobozaga.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/33253828514.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/pigunugegesufurexudukiro.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/fafivigafonig.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/kuzaxolegejijavakesobere.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/tiwutikegiwitepoketawatoz.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/tejowukariwumamonava.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6438d2bee---40973986136.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kokunapu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/sirelofagakawa.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/63022889873.pdfIn PDF document text
    • http://chamdure.com/DATA/files/8226659208.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/37878418663.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/58539682226.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/tumigoxixejoneserisuvifi.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/duminen.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/94673274723.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8db3b5cf---73074176868.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/badubokoxat.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/35054347251.pdfIn PDF document text
    • http://lejonhund.com/upload/bixuzapapofapoliliwi.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/28275116623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+add+mods+to+minecraft+mobilePDF 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_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 10856 bytes
SHA-256: 7f511125afbe6c7b581f1bb1cb268bd12324e35d581a1ccea596685e39cbf952
font_01_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 17688 bytes
SHA-256: 59be224544b5b8b50b8d7c0071d8db49ae412a780f20a183532997486c25d9dd
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1