Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb01b60fe3817626…

MALICIOUS

PDF

144.9 KB Created: 2021-08-13 16:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb85dd1ceecbba802f2d8a49be1678f5 SHA-1: a2adfcd672e7ab20c3c02340dcf7008c776b4d35 SHA-256: cb01b60fe3817626c600ed45fe8d00fde603b09c48c49089d56969b19fb47b57
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness. The document's structure suggests it functions as a link farm, likely to manipulate search engine rankings or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0dbbd3dd---dapazevumitu.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b35e79616.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a4f590d77---57594227557.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/23/file/20210723_144542_135.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/55b81d2ff562495b60303784d47690f1/xoxelimisapogupelex.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/fatuxojuta.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/11848745677.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/dufitex.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde87858f4---23222650283.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/82753234346.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/samurudaderizamegaxo.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/dubopadokowizotumutodof.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/64988023332.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/susap.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xemawerizasivejisiseme.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32d3b2e2df---pulilefemuxonorudikagogal.pdfIn PDF document text
    • https://zzhqhi.com/d/files/dixifedafusixafesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+hero+academia+manga+box+set+1-5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F63 11340 bytes
SHA-256: edc01f6270764599abd2894d7ab9c085421f2b597592a8ffdeddd690de2192eb
font_02_sfnt_off000199d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199D7 37324 bytes
SHA-256: 9e1a23e953f96b94443ebd2a9a3d033a310066aa242c909f0c9d99ea71f6b3e0
font_03_sfnt_off00020350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20350 18860 bytes
SHA-256: 53c2c9fb9dd656c8edf0e106bff081527a263f351cc32bea50d06aedf197ac2f

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