Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9740acb28b59011…

MALICIOUS

PDF

79.7 KB Created: 2021-06-01 20:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1716b224412d33c2ae7afaa03e1bde0 SHA-1: 8eea1b629206af20afbd4ed324c9fa192b640d8c SHA-256: e9740acb28b59011b369d8700eba12fe637dd03352c53d1459b16b020c879eb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan delivery. No scripts were extracted, but the structure and heuristics suggest a social engineering attack to facilitate malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5b6595fe---xizewob.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c7d9c23919f3a371207ad2ae5b3f262e/sabow.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607874304a621---zukeno.pdf
    • http://hutergroup.de/userfiles/file/39202516511.pdf
    • https://istocdukkan.com/userfiles/files/55498805548.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805b741acbe---38001321146.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084987fba5ec---jizufa.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5vojhl4ctbcgu9b823o9dt3r5t/54858182928.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4a636986---rupekumedurazawana.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/pe2l2sanpmfd9f8p6pdvu7ll49/xasorozokapojifolukir.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608975b6c6dcf---32668918906.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259b601774---gobuwirejikibotivinelozu.pdf
    • http://leebyunghun.kr/new/upload/board/files/mewimesiwibozubefi.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8ca617c437c8e5bf7e9a6b2539ed7d44/63803400692.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9b3470af4cf0cd45c7fe2b800191d6a7/gaxewiwopemixodajori.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/171eefc6ecef21a1419983425c3aee50/zobojagojixomovebudituf.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdd263c80---75186112295.pdf
    • http://aep-tc.com/cache/fck_files/file/bexidar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=el+vendedor+mas+grande+del+mundo+libro+completo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d4.bin
81ea37c214a5bb151295099197fd8ac114feed133a93a431d32d9ff4465136e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5548 bytes
font_01_sfnt_off00010898.bin
ad194820f5efcf64e01f7e9fb45bc8726e0580ba8745035d1481269c4aafcd63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 11988 bytes