Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59e0302ec4e9631…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 11:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3a7a8761458ad5c6a66370cb570d624 SHA-1: 92753ea5c4e901d8a4de23726a828b2d64b80bc9 SHA-256: b59e0302ec4e96314083896fcefb563f80d03de9ce84da8fcae6d3ddc0df32ff
236 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a lure for installing browser extensions or updates, a common social engineering tactic. It also includes links to compromised WordPress sites and disposable hosting, suggesting it is part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://garglob.ru/uplcv?utm_term=video+downloader+for+facebook PDF link annotation
    • http://unseretochter.com/images/file/gituma.pdfIn PDF document text
    • http://generaldistco.com/images/file/17428110838.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/61074392554.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1f8ef1c8---sejonumagesozixukimup.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/pazib.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/26465462965.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/42966610527.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/84887341743.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/27106655800.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/42309341048.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/38488197220.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad8286639---32708811971.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/11529045642.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/ronutapix.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210921_145955.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/84003554825.pdfIn PDF document text
    • https://eklyps.net/images/file/12267339695.pdfIn PDF document text
    • https://ahha.az/userfiles/file/kusogogomiru.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/39615909972.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/47280253194.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/mivedo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132486d84ee9---98421374790.pdfIn PDF document text
    • http://neuroxl.com/images/file/74371382342.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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10492 bytes
SHA-256: 9ab1f5815f54b7bda26edd9e307110c05262b5126cd084a116e0a2371fb85e8f
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 19920 bytes
SHA-256: 6e4f29b7e552be6d916fb26f84a3cbfaef26e084bcb435db3c863f02ab28ea96
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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