Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb95fda994cc714a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 09:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb9ca811a027c1cb66831e791ebf3067 SHA-1: e8a8ca6c958c8ff63ed45b01eee02d78b0a8c50c SHA-256: eb95fda994cc714a44cd40a431578a10f5cf96005849a18ad5d6798576e03b4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://pixomot.ru/uplcv?utm_term=makeup+words+that+start+with+c PDF link annotation
    • https://ietc-oman.saktoon.com/userfiles/files/16630983144.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/97042156595.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9b56d212---movesiduxasa.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/65822204455.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/88591259560.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/tuwomogomurifuzawibetuj.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/pofavakuseronelovetaropi.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/83012930885.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/biluviwazolitibus.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tubiwevazezobogaz.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///864083074.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vonopuvo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/tibikeresijolurajo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5b6ccde---valewidakisofa.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/narotis.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/79047211851.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090416034673499.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1takrd07pqknti75rkhlf5110g/15650823847.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/2734752966.pdfIn PDF document text
    • https://stotex.rs/files/vagojawogavunufuwugomip.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/buzijigebudanilut.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161463a59da5d3---798946446.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/34972983976.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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10732 bytes
SHA-256: 8b06a6e79633da4d9f1dd77ccea81b8e17c9ccc1e80664e84a82ce1ea84dc63b
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 18040 bytes
SHA-256: 77dcde746915b4430da788a868e6a7dd6f45648cf6fa59c9cc1cedd8d2aca31b

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