Malicious PDF — malware analysis report

Static analysis result for SHA-256 e524b76178819515…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 05:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c9ba7231dc9c8469a64ea3f3251967e SHA-1: dd5381edecaf633cad7089e6d185fb5b9c6d02dd SHA-256: e524b76178819515822a744b13c2fa7acc19116e34c78c92abad053e3cae7602
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://airconbank.com/upload/fckeditor/file/87082233025.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f7c5945d2ba0bb0c57a032a923d43dd9/legatasukofajutafen.pdfIn PDF document text
    • http://dezis.ru/uploads/files/71314946213.pdfIn PDF document text
    • https://buyafranchise.org/files/files/jobudobitukitu.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/76600497346.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/25886489826.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/xunigipebofixas.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367f8e192cf---fozep.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/detilokizenubovevof.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/36178021950.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/xeret.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/62454207623.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/75692685690.pdfIn PDF document text
    • http://teifsepahan.com/files/file/98369403880.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/32764080420.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/64746216957.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/20858093301.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lenumaku.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/31298528610.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/44923821602.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/19177289827.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/zaximexujeb.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ee2b5cc---434197963.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/jilapapegatozenizebujimad.pdfIn PDF document text
    • http://rideco.hu/upload/file/wimaladorolowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=clone+hero+meme+songs+downloadPDF 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_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 17976 bytes
SHA-256: 74ff989581da7d2d7dd5304feb7999ca1758d2b23ed0a1a2e4d12e495d08a24a
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10620 bytes
SHA-256: 8e4b72ad2df21522fa14d4bc54a5dacf004f95d67e0819859ec469f1981b14f4
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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