Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcbdaf1c8020643…

MALICIOUS

PDF

87.0 KB Created: 2021-10-07 09:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 07c9383fcfb4054297267bb46544b69a SHA-1: 80c7e024b26417800f879625c5aa6bea975bde83 SHA-256: dfcbdaf1c80206433f87611cd3b236c298457b59401556294a546dfdf6a816d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.klimavill.com/data/editorfile/kavegimixerediwetewobawor.pdf In PDF document text
    • http://urs-certification.com/gais/image/file/20886830979.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/romuzawif.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/20047795629.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/3318751487.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/duvivisusunurerid.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/difafanuliz.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/49792361167.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/82106360526.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021913846504980.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/53795593363.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ca89e78b1---16222524206.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/96455298514.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109131818288542.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/85803999343.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nunivotifitowafa.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/86997528617.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/47898948219.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/wowugibaleximod.pdfIn PDF document text
    • http://jcpingie.be/public/files/93268383045.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/fasadimazilatifatugu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615d9b0a2360a---misumidomoxotezuw.pdfIn PDF document text
    • https://shunnasato.com/87794689777.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16133ca08c16d7---20949745012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=college+fbs+scoresPDF 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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10228 bytes
SHA-256: f60165921faea56691d1fbd38426e87d085bf65d462bf19adb4e769c2ff5d434
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 18436 bytes
SHA-256: 7ca9fe833405b72941ea5a1728e359d92259b45a8fdc17e20908472488926034
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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