Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c22678d355067c…

MALICIOUS

PDF

86.0 KB Created: 2021-08-23 12:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a56540f2b093991bfebebc9387340688 SHA-1: db964e5dcd6b458e59c1db24d111dcdb96344da1 SHA-256: 42c22678d355067c7e06f6ad3cbc00ad8b84a021700d4ff04e9dd066587e52c4
64 Risk Score

Malware Insights

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

The PDF document contains a link farm, with numerous URLs pointing to compromised CMS upload directories. These links are likely intended to manipulate search engine rankings or lead users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort for SEO poisoning or traffic redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4115

Heuristics 4

  • 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
  • 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gjla57fkaui79oib8t4ucg23vn/32756124928.pdf In PDF document text
    • http://ferramentabelleggia.it/public/file/37346936655.pdfIn PDF document text
    • https://davaocarrental.com/images/file/megoluginusikuj.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160db0ce8a97b4---48525560152.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/lolopisomit.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/17980555409.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/vuxepo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161039ac14203c---tebasesifivavo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0ee5ae0b2155c8fa2bf57f67ace3d03c/15429957289.pdfIn PDF document text
    • https://ekransamara.ru/files/zenanafuz.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/1qd5hbsk78uf7hdhf9qmcamgr7/rekofixa.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kd99oh5go3lvsencjsmfgpu9u5/44508871257.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/68210178739.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/jirakatewugapu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fr7i0nn6vjv4la2gbngcb3bkhr/lisotugumikixow.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc765c948---ramorinavodub.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be77546826c---78457756467.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7bcd89a7---nisonelenidodumoziwanipaj.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/71052028936.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160895207cb26f---nivudusobegegaxek.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/77818991782.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a11016058d---fuvebusedaginujimivudosad.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/31923159235.pdfIn PDF document text
    • https://limmaginebistrot.com/file/vonutabowewez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+exercise+to+lose+side+belly+fatPDF link annotation
    • 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_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 16836 bytes
SHA-256: f191bf72286c8af243f8846cd834072a2be7f651cad8755d18fcb9e9fdca8d77
font_02_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 10772 bytes
SHA-256: 22209b79843ffbef0da02e511db2d494dfb8885fbe69684ae9efe8d1b21fc94c