Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c025196245f53b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 04:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4adb91ed197c9768e51d9598c2a9059b SHA-1: 936f528ea00c016791c6a11b0d0e7382e79bc470 SHA-256: a7c025196245f53b0821b3ac8a4acd908e921136828d6f23e28337dcb11a71d1
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure and a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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 http://reelproductionshd.com/userfiles/file/85036095242.pdf In PDF document text
    • http://fiumevivo.it/userfiles/files/kugusoposov.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/17276252389.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1610038e0640a9---pusivijuvuxogukixet.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b0b84bd88810d2923f522955d85ca9ed/leranofuminuxanare.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/marujok.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/popomomoximemopezo.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/nefukemotiwovovuxe.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/zuwuvopudiv.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8fbqc5npbr21qkm8j32pi676je/jilebijemulugepajo.pdfIn PDF document text
    • http://usateatop.com/_upload/files/36918420838.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/33948984830.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3353c30a5---moritegiworiwexi.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/66865880204.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a4c534d0---68603573061.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/bivivasovugupebakoro.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/82494192470.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be1102a765a---fopajofitibukupebabani.pdfIn PDF document text
    • http://agro-partner.com/Image/files/faboveritixewali.pdfIn PDF document text
    • http://guitarenko.fr/img/files/63093466159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=digital+signature+online+form+pdfPDF 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_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 15908 bytes
SHA-256: 7893faa562dc24c57922b5b8ec61d65e59cddc5f6a4868e0769b0c1c1a137895
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10944 bytes
SHA-256: 4b92c6029be04712eb5f478907c834d392a71f9acba3f1b15ab9e453f3a30719

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