Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40f1f9039c619a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 20:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4f11d7a67cf02f3ef71e88d0dd5c387 SHA-1: fa854a1da549045a6aaa7166dcc000f54aefe3cd SHA-256: ef40f1f9039c619a5a3dd05ec133456bf015ed9e7623a367d0f71b84c9412fe8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains numerous external links, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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
  • 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=effects+of+legitimate+trade+in+west+africa+pdf PDF link annotation
    • https://petala.gr/userfiles/file/73842033701.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f4ed9644---75095592308.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2413e8d53---kikedejopuguzukiki.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131af2c52045---fepovi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e3tth54dgpqqdmp1idece7jfp5/25841230099.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/xemotiladudumus.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/ruruvirarexogo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/03768c017eb8dba49d3219a326fb5f20/81765965771.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ap8q4e28r0purqe8hbclkj6une/kiwelu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/289233ae261cd0f466474c8e0781581d/xofamezomazevubilag.pdfIn PDF document text
    • https://egf.tw/test2/images/file/79795643715.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/13024857891.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080929923884---26948816900.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/waxomasewujavedisan.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbadc43b29---ponuvoxonetisomamumamike.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2afosc0923d6ora27p2b10i6f1/vusep.pdfIn PDF document text
    • https://ksboutlet.com/file/files/tumijonob.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/1245403514.pdfIn PDF document text
    • https://haidangpc.com/contents/files/napoderipokujoko.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/pirufexefelusuduso.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a16c0e19---vuvin.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_off0000c561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC561 16896 bytes
SHA-256: fce7ddd5d783b4a6c6056f355c2820fbacfe1e6f7531550c4efd81263016207e
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 11032 bytes
SHA-256: 8cfea4bcbb9dc8d5efb94071ece4f27b728d0ea7739c9f51a90c8892c1677c45
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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