Malicious PDF — malware analysis report

Static analysis result for SHA-256 49adc1c8869f6af4…

MALICIOUS

PDF

88.3 KB Created: 2021-07-14 09:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0995ba4989d5563f06074f35719078d SHA-1: c70d5a197755bfbf72985728ac8f7e68645450e4 SHA-256: 49adc1c8869f6af488a21bad4898b155124d63eb402b696acc8ee8ff1284981e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=what+should+we+do+to+protect+endangered+animals
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c91649420---raparimiwi.pdf
    • http://detaycopymatbaa.com/userfiles/file/6104786692.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6081bc5aa5e463accb531ff873f0e5b4/98359487525.pdf
    • http://bajajsports.com/userfiles/file/dofixukimotatilo.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/6b896bd5552763c6bb1ebb0222ec658d/ludizono.pdf
    • http://4reality.cz/userfiles/files/mekevapadavetakovojir.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/87aeda65ef67da4d5ecbd0bffc66661f/vowur.pdf
    • https://masini-de-ambalat.ro/images/userfiles/banena.pdf
    • http://anandamsanyal.com/userfiles/file/jaxajuzulifubelekug.pdf
    • https://glycocalyx.nl/userfiles/image/file/sovurelibu.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f939973a9---75096611703.pdf
    • http://toshiteriyakiburien.com/uploads/files/buzaw.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad77962ee4f---66982777510.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae924c0d8---14022513286.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd81a5a3b38---83548571200.pdf
    • http://logistra.fr/ressource/site-image/files/banajividajubi.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k2m6e7a854nhnas22537sp67f4/60409122351.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/vokurov.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cfec4f44a980d74c8d73bb27292e5ec3/19444259672.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/416453759ff73247625c968ecae628d8/dasixabuzowivoranobo.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ketua9kk541ocganasdp2tqv86/66132792726.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ebc8444b7---25491885872.pdf
    • https://ovalpolycoats.com/media/nuwozinifebeviz.pdf
    • http://scandirent-new.ru/uploads/assets/file/mobawubegukovuwuxas.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49b.bin
9c6ad27c4db8fa70f5a143174d979c7602fa2fc019675574d358911de096aeec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 11140 bytes
font_01_sfnt_off00010e4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 16792 bytes
font_02_sfnt_off00012660.bin
2f6b1380836887bd028167450debf125283396065e356c6164aeebd11d1884ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 17184 bytes