Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4f5150d68eac7b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 16:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ead44a2a0f9cc2de185c305d50a243f3 SHA-1: 1bba5ae5715c45a6e4445ecce57492b6e5c7f409 SHA-256: 3f4f5150d68eac7bcabeed3a429a36da5eb5b660962bc46c1079b9ab78bd5efe
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method to evade initial gateway scanning. Embedded JavaScript was also detected, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede528f5a5---85863898620.pdf In PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/60262538650.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/loledidupowananetolulube.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907150314251.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/zivudokawe.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/parulav.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/wotorezozuzexat.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/981addd4928cff7a901ab18e9473adc1/wotuvefurujozajevovuj.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/95087881903.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502f2813e2---perizag.pdfIn PDF document text
    • http://apismorava.eu/docs/64704192807.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630872135B9SK.pdfIn PDF document text
    • http://egitara.com/upfiles/files/5158261615.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dabikutogamor.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/24405031029.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/46449084871.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/zemisokazokavi.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/46611434906.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/kotumepusobijipalez.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/bewalolagizab.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/defemegigevines.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=digimon+rumble+arena+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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10664 bytes
SHA-256: 468b3ed11933cc6ee87286589b73a6547c7d605f8c0ff91b0b87faf530ebff47
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 19108 bytes
SHA-256: dce4d312fe3586d81a0ef67cb72200ce5c69a42360f88fac7e7a9c3f05362602
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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