Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcf456fa3fc0ddb…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 11:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 937555e69f14f4a56faaba85e99985e8 SHA-1: 20dd26b5cf359f12bed0dfcf665e087c8f91b574 SHA-256: bbcf456fa3fc0ddb031b8ba46f4ec095dbeb6bddd49a6f614ee105f8ba849426
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. The primary lure appears to be 'website to download korean dramas for free', suggesting a phishing attempt to steal credentials or deliver malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161313f8d97019---soxonorefukasowirutoli.pdf In PDF document text
    • http://brcassociati.com/userfiles/files/repavizes.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6a11d4c9---zojev.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zenoliketusutekizev.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/rozikajidigaroge.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/94012898332.pdfIn PDF document text
    • http://infracsap.hu/files/file/92126451735.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/2117609077.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/bonerivejovamolap.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96942c5f2---7052522260.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/47918415517.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/bekiwawo.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/kalobojoxozuginukawi.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109060545252500.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/pudofezibetaxi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134333fbbc1a---10133406872.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/josafagipipewore.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/81187231535.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/75f044af1e98245e57c1076591507637/gujukuverilakadub.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/54579197851.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae9252c1b9---gekilomabimepodepawijov.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/67413798740.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/62475935789.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2db8e041f1050afe00af7458b7d40d90/87650039176.pdfIn PDF document text
    • https://posh.hr/files/tibujemelawax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=website+to+download+korean+dramas+for+freePDF 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_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 17048 bytes
SHA-256: e3707d8518103bbb16125ba47a7a36a313045d82c706b728aed6c683b245ee03
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 10828 bytes
SHA-256: 77f79fa4225b8bebea2b03acfb75c092bd06b6f11d0b98e02f179f25dbde02cc
font_02_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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