Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0742254c2de92bb…

MALICIOUS

PDF

90.9 KB Created: 2021-07-12 16:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c71eb9f558573e3e6e74bc7f3374297e SHA-1: fa0d7915bc4d7e04f22581260b3d9521ed441927 SHA-256: c0742254c2de92bb8f2215cbf5ec884aeaa6ff97d3f5cd1e86e1c611bfeb0e2b
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS upload directories. The ML classifier strongly indicates maliciousness. The document body is unreadable, but the heuristics and URLs suggest the primary purpose is to redirect users to potentially malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c2962e5c---53042854327.pdf In PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/43969103260.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/482bc536c102e4cfb30d5b071ace4e64/13243546965.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/solupiviwosazoj.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zimetinadubalawilez.pdfIn PDF document text
    • https://parfumzone.ro/files/file/xananisefiwavapazunumevup.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160749e8950aa3---62815959913.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ddcc00f27---sitozadiwawutijoruwo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/55232008327.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/redogesejewezifagabesovul.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/batorejoritomapon.pdfIn PDF document text
    • http://maihome.hu/admin1/file/24929736619.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vebapapixabatusez.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/lexusenizarozulodavepiker.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/zexukadaxidanefejariwizam.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e5e340b2---277017188.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/pd0fifabdf4mo3b6t4d6vh67i1/sozerizo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/niv5lu5n66cp710ta2jdvn4hgj/89360070160.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/bugatukoti.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16098507ea0193---wowonedofuvop.pdfIn PDF document text
    • http://dentherapia.hu/files/file/7565416031.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/36386696917.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9ba40aa6acaa05dc4d0062ad32129f6a/35709327356.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/rigarar.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lifakujaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=growing+eucalyptus+from+cuttingsPDF 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_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 17344 bytes
SHA-256: b4b6bc7e5b0c117b223cfe0e45aa83a41b2f32ad2b411adeee96c1480c62d515
font_01_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 11164 bytes
SHA-256: 8c132c5e72d0353d1853f9e8a0e65ad96957bd7f5b522f56dfe1fc6d7d06c76e
font_02_sfnt_off00014639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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