Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8261d5c278f594…

MALICIOUS

PDF

69.5 KB Created: 2021-09-05 12:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b512db7f268b2d6aed6e9d8ba825390f SHA-1: abb2c886bc2ad8ea5628894c4b97aa84f222b013 SHA-256: ee8261d5c278f594f64b0b298be853da0384f77a702b9b5f3b283a9c8319e319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=adjectives+lesson+pdf PDF link annotation
    • http://kramor.bg/userfiles/file/37556629935.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/gitemeribizikofuzatono.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7efb5eafb800028dba17eb559d61027e/gubopujevegugeramatebeja.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/34903288473.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dokivofopurixibunirabov.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/godazirujigewoviro.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/vadewibituj.pdfIn PDF document text
    • https://immobilgold.com/file/fatemosukejavewufiwedex.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/33856429466.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c70e64d49---70921832014.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/9darvncv2m0leu4oag1aaifu48/88641883142.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091cabd57087---libagipeniva.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160803c499603b---kavowumup.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210719_C1F31CAA566E276A.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609402b8af72e---57921752955.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b9f89808---biwuwaposoxoxefu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4777a01c01c6f5b73fe310d1916db440/22158265004.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/mosakuvilofufipokaken.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/42963869455.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/34289810991.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3094dd8d5a4f7a5d3bd74a80b20a6032/3563228612.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf664a805---73595610739.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e0be1d5a9d21d1b3affa993ed094e0c/vovepubu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8be1b063---21075473738.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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 14456 bytes
SHA-256: 285185919c0316fa74268d4b97827e09d0295ee3fe7b29d09e1f8f1fbf7c4530
font_02_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 10528 bytes
SHA-256: 6dd3e7da477ac0caf25fb1a75abfd3a66968d69af2050d9a668f0ed81bbba900

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