Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaba2607e9a19dca…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 04:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 459f4934ce95449010a92703ee7bf63f SHA-1: 618c3e314bee942f9c3fea78e6be75cbb73ea52e SHA-256: eaba2607e9a19dca11787a7295b9f843d2a17cfedcb0c2c71ecdf17a266c8792
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488cf9dd05---20758848099.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/89eeffbd8e2dd90de33af812a9847cc5/79585957130.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/mefubudogilugezidazu.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/filidifaxufenovitepike.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/supukenazowexiso.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/xijesogofuvukarejefamuso.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/82583823702.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/84221122245.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745ccadee4---87473056738.pdfIn PDF document text
    • http://altinay-law.com/images/file/vazimekawuxoxuzamopamas.pdfIn PDF document text
    • http://metallpress.ru/files/fejexaj.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210913_404CE5A5E2638D14.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/77377303869.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/87007733879.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/40c3f4404836464435a09f98c937b28b/kopivirekuxaw.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/vesitiwogosiwu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/rejositi.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/32348036640.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/rosapavujiku.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/49226192572.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132937436b05---2605460980.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/18236211316.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/luniwenobudidodologanam.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/97683094170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=game+pubg+lite+apkPDF 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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 16708 bytes
SHA-256: 8e707670135ca9e4165884ec785475276a50f5eeba8026c7aef95f0dcaaa003c
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 10476 bytes
SHA-256: 47e72505330bdaf3a49047412460d9965e2bc4eae50522161626509645265a4b

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