Malicious PDF — malware analysis report

Static analysis result for SHA-256 8605532eeab0ab41…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 01:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fab3ff7197ef744eb7f55ba048704977 SHA-1: afc7b7e3179f09bcb1ed1b251fb91f44a54a2240 SHA-256: 8605532eeab0ab414f6286f1be89e3d1172bdabb86ae56da96330db88e8a6e56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, while the link farm serves as a lure for users to access potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d02132c18---vidilugipajagamanizatip.pdf In PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/98501856382.pdfIn PDF document text
    • http://roocenter.ru/upload/file/kumariwezorusiwinibedo.pdfIn PDF document text
    • https://empresa-venta.hr/files/3636980727.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/47805826277.pdfIn PDF document text
    • http://contextuae.com/resimler/files/35784712162.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/38919500006.pdfIn PDF document text
    • https://latework.cz/soubory/rozotugibirurerum.pdfIn PDF document text
    • http://thegioioto.store/upload/files/93694951927.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed0fe0645---40995630513.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/gakolokode.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/vobilutetubi.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/zeniduvanixa.pdfIn PDF document text
    • https://derfo.info/resimler/files/5544986767.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/fusuzenaxinofaduvizetade.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/31324750049.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/15150325764.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1b286dc71---62850175645.pdfIn PDF document text
    • https://jss-moms.si/upload/File/52514136370.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/xepijagebobodeveparofa.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/58212719509.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xefizuzomasaregi.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/61747459787.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/vaxini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=guitar+hero+flash+game+unblockedPDF 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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 11292 bytes
SHA-256: 49c0466aed12fae7f8874d27624117d2828bbca23dfcf0ac5f4cf8ec814238f3
font_02_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 16652 bytes
SHA-256: fa266963aed281019fa0500df81db342d342414bcb02493b08ab9bc9b59859e1