Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e95d165e9cebd9f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43e4cccae52e82f6babba65ca7ae0fd7 SHA-1: 2e6051f076a2d4a8348fc8d6a81333095a034815 SHA-256: 7e95d165e9cebd9f31344d05a2cac029bc3dc2f2ed9b8d02a212a7c8e1ebd127
96 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to compromised WordPress sites, suggesting a link farm or distribution mechanism. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and numerous URLs suggest the document is designed to lead users to other malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://gardatrans.com/content/Files/2197428754.pdf In PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/dakuretexidufizupegufis.pdfIn PDF document text
    • http://gardatrans.com/content/Files/kemexapitepaneminosuxufo.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921858939dc---xatekejuwolanepepek.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5f6de227c567ae1db7859fda3514ceab/mogajodelizi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/35728109867.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874bffa808e---59107463427.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/47210708449.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4c46510ed063a88720c35ded823c741/92486544183.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82f5a759a---gekegexusuvajuw.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/66977886964.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6a59f30f---xofamofituvifib.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd56c77da34---dimefejigofixezumaminuvo.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/folimajonika.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/56192104003.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7177cd602e---6492479774.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/7510674707.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nasononokexanofosekik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aef9de47c---51943323001.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/93636502275.pdfIn PDF document text
    • http://safarang.com/basefile/files/18429805330.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxuburixunijowekan.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4061b5ab7e4b1d7d16d6029fe32670c3/vevorunid.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/71538719768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jobs+to+be+done+theory+to+practice+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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 17068 bytes
SHA-256: 30630e670284a55c118245f61e5f1dd59f203cfea4e0d3c0239a76570cc81fb5
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 10916 bytes
SHA-256: 1e89062bc10c71359e26d2c5774358e26b38903be3c71e3de792fa06e8edb722