Malicious PDF — malware analysis report

Static analysis result for SHA-256 961e1d71a3c74df5…

MALICIOUS

PDF

86.5 KB Created: 2021-08-18 11:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3142726486ec9e2b3b8a4656da96720a SHA-1: 28caeed916b8d79c67db392ea38b52142cf2317d SHA-256: 961e1d71a3c74df5a557f475181d2ef90c93d6804ba505efb0ce083ce834b4d3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a malicious file. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent to distribute malware. No scripts were extracted, but the overall structure suggests a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.juniorcollege.cl/ckfinder/userfiles/files/zajupebazabigegalegiti.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/62477380086.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b787df2b806---lumivizexivuturat.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8df8c632---xuvupovekunuge.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/ginavemixuvawuwaze.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c67ea1a6a---95719936901.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/mowusapas.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16110e1ab0fdab---xisufozupegaveseditetas.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8a929970854bcd60a0ea22bd7f14b145/tubitebibidefozoribi.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/kozipemopumubijawewub.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/rurewimadewuvirogejozat.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/99948861113.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/82169830692.pdfIn PDF document text
    • http://bjjiffy.com/upload/71082739866.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0e704cd6---waxezinubosuze.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb59e5837a---98394505610.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/gexasiruzimobosipin.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/bukeriresudasire.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/wodepameri.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fa5315f2---fesoli.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/67489562975.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27ac598bc---jaxezil.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b668a68d34---77276605821.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/59234449401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=naruto+run+game+download+for+androidPDF link annotation
    • 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_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 16984 bytes
SHA-256: 492eb2aafb2d1942b349fc27891098c72514b5676285f3dcf8ab4a6dc2a6c5b7
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10692 bytes
SHA-256: f8c17ea1b775cf9867ef16b5502a20e2fd2f32152ae10bee87fefb144df42e2a
font_02_sfnt_off0001331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1