Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcff0ae492edb998…

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 01:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9856935534f4a29f38ff2713b215f5f3 SHA-1: 6bbc0acdf16ea7418b174fdf06283a687df3a678 SHA-256: bcff0ae492edb998662ce8761186051286d7c843366e7378af7400681d30b7af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=laws+of+integral+indices+exercise PDF link annotation
    • http://boden.boj.se/uploads/userfiles/files/76317029916.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/nenobekewamodogol.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/19867687817.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/fesuresal.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/neturukoruvudagajoz.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/94784043637.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/juzoxifakefijawesuxiz.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/8229677327.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/38410129038.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/vusexopawutagiw.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamevovawopo.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/38436190807.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/dolujasizazid.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/37488786663.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/38ea7a4ef88c3f794bf76e018b1dd82a/14483945473.pdfIn PDF document text
    • http://irths.com/upload_files/files/pifupujelufuwurumedogolan.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/78972366592.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/naramawetodubaj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e1051dcc05---81734186345.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/66044721354.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f884a446f6---xirojasafewimosarefole.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/48646051991.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/40896166435.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_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 20784 bytes
SHA-256: 3046f4a0e664a33ff4ed2bddec17103c283ddd40a3417c5325228bd64d0378c3
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 10796 bytes
SHA-256: 0776789eea7fc99e588b31b12e078f72612ff5fef9b5d067b924753fefa783c3

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