Malicious PDF — malware analysis report

Static analysis result for SHA-256 afff49dfaab52d95…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 13:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e5bda90f49cb6b8521ab36a2ea33ea SHA-1: 7388967f198d791f79c9e52b3510a4882b732945 SHA-256: afff49dfaab52d95cd410b39cccef05ff28330580a76786627e4e1f410478daa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to multiple compromised WordPress upload storage locations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9ac651e1fe7874f43b592750f8d41395/24950391546.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a028be566---51325659219.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d196d62d4aa4004b8a1481bdfbc866e1/naberasozofegos.pdf
    • http://cnokorea.com/userfiles/file/67462621263.pdf
    • https://hissekurban.com/resimler/files/gexamezanixojef.pdf
    • https://contabil-fiscal.ro/mm/file/fuzonovowigiruroz.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1365d4318---nusikizakatap.pdf
    • http://allmedicus.com/userfiles/file/wusugotawiwolo.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2985cc22---35203066363.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823722594aa---viligexumexivarijupotel.pdf
    • http://slsnn.ru/content/file/76213903135.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/53129544208.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ceb8251181ccdb3204dfb1f9faf4e754/zereren.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7616af62f85ed83c9c4f478db3dc214d/11861256745.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608036d76f136---xafifekuso.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/velubodazub.pdf
    • http://edumedcare.pl/upload/files/fixilerezawozu.pdf
    • http://abaj.cz/UserFiles/File/pemuvemiril.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210519120307524198o5baio.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c38777d3---bixisuboxasub.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca6b37e3f---72578712824.pdf
    • http://ersatzmonitor.de/userfiles/file/46181908558.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3sakfd70vqh2qrdhi54a1mapo8/bizelukisi.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e4c9a0c73---taluvideredoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=another+word+for+wonderful+person
    • 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_off0000fd17.bin
0073cbb22bb997d1f8acc0480b1c13ed9cda800e59422ee5aa37c01de0e0b047
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 17372 bytes
font_01_sfnt_off000129ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 16792 bytes
font_02_sfnt_off00014203.bin
5d1bc0eb5029ded7c76b832db36679896f1e95059c85d761a4196d9aca75638c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14203 10508 bytes