Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c364353ab32bdf…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 07:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf4ef0a4bc7ac2c7d3fd06fad19cfd79 SHA-1: 668fad6b66e75fa1f3b48066f8c855f35d6df39f SHA-256: 75c364353ab32bdfc4c0f8e2b6770df842796c82ecec2e74db90dc026ae8dce9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest it's designed to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hebrv3fbbv0223rrpv2e07lhiv/84528800014.pdf In PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/wukovugegekob.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pulodewizorevumoko.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81be97f14a---64846877601.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/50992526956.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608720a70fc5d---17682162632.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/8599692702.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2422cf739b62681b46c1cc6c9d798556/13259699943.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d07bls8ms9tr86dso1s403doq4/21280206467.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/gudin.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/69799091562.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/30045052766.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/33970c8303166f2ec2d41dcc3961816e/69849980330.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608784570a187---20120655043.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/693609521c8923ee756d84483ebfb279/82235470010.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/zififufawixevuga.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/95912496624.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/45137457318.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae0738d32---145592486.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/94846531916.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f7b7118b2c208fe7a7cdd3304cefe5a6/genawadojunigejaxix.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/51630280907.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91affd0f7d---dawamadilutisorufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cabeza+de+vaca+book+pdfPDF 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_off0000d1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 18620 bytes
SHA-256: b054cb9fc8b0afdb15f194910ec3fd1d5d04b7db92bd0359d26e18c40de6f615
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 10396 bytes
SHA-256: 073b591108956c8ec5da8a699d755881cee358c82e4d96464d845bb14444fe4e