Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac6ece548cda8ba…

MALICIOUS

PDF

95.7 KB Created: 2021-09-14 19:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e81e03e12e83ef0c81ac184f6e8486bb SHA-1: 6c72392c0972e9a3272cd7289c0e4af96ac435d5 SHA-256: 7ac6ece548cda8bacd421acaa87f7797187aaaedebd74fa492fcf3fdf51780f2
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it acts as a lure, instructing users to disable security software and providing a password for an archive, likely to facilitate the download of a second-stage payload. The presence of numerous links to potentially compromised or disposable hosting further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cosmopolitanhotel.eu/uploads/wysiwyg/files/rovifu.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70d4ccae3---40240009095.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/60372410645.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/rujesowasolukex.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/givugiredaboloxamaja.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/bobagufumivojasaridovuwu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/70860854566.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/64896472741.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613528d43de9f---74438272804.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/xifebaburuduzexupemad.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1148590f05ea11e2d7bdb4fc8d727c4b/76174007701.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3541a06e---fasegekateluvesilapenipo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e24381de5ffa439792126ccc9b459e07/56590997821.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/zudidabu.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/28890156264.pdfIn PDF document text
    • https://polandpools.com/contents/files/pevidilifa.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/6745601236.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/wejegomoruzibabaxobolovi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613230570efd3---20040755571.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132977775472---48850693666.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/35594510932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=grand+theft+auto+iv+the+lost+and+damned+download+for+androidPDF 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_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 21536 bytes
SHA-256: 579ae6de138b154941f2f0b9eca3ff5d005aede0f46ca902eedf876e8da22481
font_02_sfnt_off00015650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15650 10908 bytes
SHA-256: e51332cd996d667f5b3c5bc1663ae6bed5c963d8f0c68feaff92e0fe4a1c0194

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