Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2d48b567f0f928…

MALICIOUS

PDF

129.1 KB Created: 2021-07-28 05:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 123e749376ddd81f307140deb800c5ee SHA-1: 78bfbd0bca039728cc783b0fabe0daaab4c69201 SHA-256: 8e2d48b567f0f928f4c88ab823defc60ed89311b8afae3094e8bdd6f460fbb15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings point to the document's primary function being to host and distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gpgdf1rvtac56a0hm0p8n65stg/vifapunipewakokipudireba.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20b031c06.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/kntv2iksrqen3tj3mcnes6dhfg/nonos.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1df0aaf2---6646060047.pdf
    • http://southport1969.com/clients/861680/File/kibafun.pdf
    • https://aymsoft.us/aym_image/files/vazewor.pdf
    • http://castrolmintabolt.hu/images/upload/file/retifexinuta.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62a412a8f---55147512791.pdf
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/6ae0d1f3be71d76c10a367362d866cae/22109074220.pdf
    • http://kwartetproforma.com/userfiles/file/zolinibevim.pdf
    • https://yuss.it/file/pupokapozilugunademuj.pdf
    • https://actorconseil.com/files/file/85710470254.pdf
    • http://diamondsnspurs.com/clients/12200/File/29411001219.pdf
    • http://s-privod.ru/userfiles/file/fekalejijalunivoroxiti.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/n57sfh03ve8t1bquked0vundt3/jeberosimenoturepomaxo.pdf
    • http://mp-journal.com/media/file/rakumametubukase.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608090495125f---78867278380.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8be010a95b---77087149907.pdf
    • http://yongqingtech.com/d/files/15053496966.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/buxudowowumoxekarup.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2efdae0c7---jodimovujerasezer.pdf
    • http://trans-serwis.com/userfiles/file/xunafufuzajibawonu.pdf
    • http://er-trans.com/img/produkty/files/91546022240.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+omega+emerald+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152B6 16792 bytes
font_01_sfnt_off00016acd.bin
b8a1cd72ac258bf88aa389a704e8e2a7c40ff48c8809f888186da74c8eb0edec
pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACD 10412 bytes
font_02_sfnt_off00018234.bin
0b92161763352f0a84694c0b98400db8853f1e01989b3347660deef163a3a5fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x18234 18276 bytes
font_03_sfnt_off0001b148.bin
37b1d644e8f9c5a9fc0cc9bdcec5989d9bfa0384e025e4a0433777f4689d1ab8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B148 22440 bytes