Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6f64b861c7bff6…

MALICIOUS

PDF

87.9 KB Created: 2021-08-22 03:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d55b259f1af760a11dc924c59b98812e SHA-1: 35e22f9681817441e7994c3db5c391c909618f7d SHA-256: ca6f64b861c7bff6d3f0d10757d20f5f128c5f88d772b483a499d1a9deb51bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=how+do+i+download+esp8266wifi+h+library PDF link annotation
    • http://lactopad.com/uploads/files/74617167895.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/zegatajusedelefutufote.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210818162807710767098mrthyevcj.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/14745466756.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/rulajotawalusaxeliwonud.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/22877288512.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/83172023502.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/buxariguk.pdfIn PDF document text
    • https://soechi.net/userfiles/file/42439242052.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tepoxopoxemo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fc00a589061717c77af4df985e22fa7e/fofunodigojoral.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607666da386f1---vegidilelaxafisosifipi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161036b9be69ed---57794564401.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f8e5aadcbb94f2d02b656a7463933873/gufime.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/niwatabuxupopegu.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/sewapogejelujadijaj.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a6663fef---gewefatirolamupoxin.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/29917271304.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/78187830614.pdfIn PDF document text
    • http://teraval.cz/res/file/wupiz.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/moranuxenafukaduneke.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/28795694969.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/471cafd30b8cfb84a55b18b584964b04/47180603100.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 18540 bytes
SHA-256: 93b7884ec3f49219e16e8f759fa7cbf1c3fbd0a86912998e0d71a79922b22bb0
font_02_sfnt_off0001366c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366C 11324 bytes
SHA-256: d05507f03e7f0326889a9db69b5dbfbd673f6441d453ef08a440837745d39761

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