Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f7302fcc7c3137…

MALICIOUS

PDF

75.7 KB Created: 2021-09-22 09:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2239337c05879a6d2268a609d93b1e2 SHA-1: 95a104bf4f0cfc1fd71fe465bd680ac6f8c9bc48 SHA-256: c8f7302fcc7c313712230b8ac334a20c0a8cc82d39b70b9e6ba3b17cb0ba1c3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=the+pirate+bays+proxy+list+2020 PDF link annotation
    • http://brandiassociati.it/userfiles/file/resalogesirakot.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109110313556769.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210917173629.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_190759.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/003rau7fdjk75g89d2ci5bol02/39768857390.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/nupumemizemewetosebuwur.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dumosi.pdfIn PDF document text
    • http://hotstamping.pl/files/file/15548311507.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613102d72c3ff---7602580188.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/bugemolilu.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/63794192942.pdfIn PDF document text
    • https://armenia4d.com/contents/files/rivajogi.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/nemafadowol.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/93426634868.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a9ee6223---zofapigoveropezumenepure.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cfcf79f---12947268228.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/bavosu.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/bozovevova.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d13c56bfcfcf4845aa395deca8079da/fokojudiremudesuw.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-16-11-27-22-43.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/54894992766.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/giximefudilekafapex.pdfIn PDF document text
    • http://fkhd.cz/data/img/rojugusokozija.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/99a3659903d8ab2ba57f5bcd0ef67364/bebaxufo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/bisesifujez.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/vonumomupibusorebitabu.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_off0000c4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A5 16980 bytes
SHA-256: baf3b297f09ca8b73e25ae2956b4492b0c130808b95511adb4c84400f5cec034
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10808 bytes
SHA-256: 9782c7cef21908f08a8912346d2eee558c7a81f9f6de1c626b8b62f53bd927dd

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