Malicious PDF — malware analysis report

Static analysis result for SHA-256 3360e71ac41b8e83…

MALICIOUS

PDF

128.7 KB Created: 2021-07-06 16:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1694bea7800a044cc2906721a28ddad4 SHA-1: d22cf4c731ac3c6dd578873168efa2836d033879 SHA-256: 3360e71ac41b8e83cecd1b9905f616c515b89beb331838982f52b8e173dcd0f3
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=politics+power+and+the+common+good+5th+edition+pdf+free
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/xuvodomejami.pdf
    • http://montaze.org/democms/userfiles/file/kazitilok.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/121d64d6fde73d2ea04558ed297c8687/ravekorabonikubirazexuxa.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5ubsk07j4lrue3547b4b91gl9e/79995185936.pdf
    • https://fzclicks.com/demo/files/editor/file/90892944918.pdf
    • http://sllight.ru/design/img/upload/file/rokebofobinivewovujasakev.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/79ffa44adacbe8e6bddecf54124cd629/13678672635.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f102d9b9ea---wewupovasusujekadixisan.pdf
    • https://aduanaldelvalle.mx/userfiles/file/nanikokodunogatetusulu.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608726e211e60---32407250905.pdf
    • http://dgjst.com/upfile/file/totulefinojipaza.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0f7090341777b9f2e81567c4a1ea997b/65613631188.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb9c826829---wuvejawo.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e825a0324---71494477802.pdf
    • http://kaies.cn/upfiles/file/85869148841.pdf
    • https://combrooncom.com/contents//files/51815262659.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b271b7c1af---ripanexagisu.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1eb0bc353---47022808062.pdf
    • http://amuseonline.com/absite/userfiles/file/19438099442.pdf
    • http://interface-referencement.com/userfiles/file/31112139459.pdf
    • http://voszveszprem.hu/_user/file/kijakinolupenatala.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dv6i3agkmtn6jadqjtbom7srte/9531391186.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/pilojuvuze.pdf
    • 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_off000190f5.bin
f5f5d669156dff3aacd2c259337d42558bc5d28c9db422887a990041eb3b2694
pdf-font-stream PDF embedded font (sfnt) at offset 0x190F5 11288 bytes
font_01_sfnt_off0001ab2c.bin
24c3f0d78078ea0df034a0c410ba34c127b8db43028bccc2db47a8e66fb56f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB2C 19276 bytes
font_02_sfnt_off0001da81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA81 16792 bytes