Malicious PDF — malware analysis report

Static analysis result for SHA-256 851596796c079239…

MALICIOUS

PDF

83.4 KB Created: 2021-07-01 20:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb60831a20d0b16fdead27e1a894d840 SHA-1: d781f4f253bf045d2f78fa2351d2176b4e3b5f97 SHA-256: 851596796c07923932eb501feca9d621325f2fd48f6452d0f30e07ee8c0ee719
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The primary goal appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5d9f59e26e2b52902d95345c63fc813/sapoxa.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/15183464497.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a74830a0ad8---97468913262.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160800729532ec---70762530248.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d09c8c25b0f87bb388f8fae5efd43ebd/zatem.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/52bd0e164db9e687338c5e9958cde5a4/sulufazekatepafafulibed.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e93bb13251d8e90b6e49e4128eaaf643/vozageruriwebokaba.pdf
    • http://lookkorea.net/userfiles/file/93362875818.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b368eb6ea59---soligajewiw.pdf
    • http://sharise.net/Uploadfiles/files/vupodiva.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160990663ac48b---82272975625.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bd4d99dd7ea028ffbbfbe1a19822cd5e/wadogonini.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/09784fe952fd85a2eda466d076869bef/29475474078.pdf
    • http://uleshuzatshop.hu/files/file/liwigoxor.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e002efa12---nomalirikozezemipudi.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c04cd804---75358585975.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8377a111e---gifanobevubulitegom.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a647927ca4e---lovedewuzumowomavibop.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/eeee6c11dc7a48189ac3553fa5a0343f/29000090482.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5d44c2055de7d247227345ba28fa017d/rowutixalax.pdf
    • http://work4shop.cz/userfiles/file/18469287333.pdf
    • http://www.tobywells.org/media/fckdir/file/90446119752.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/01d23025b933a9ff1f7aaf3af19d5155/jajeroxomeromejewof.pdf
    • https://ckmusicdesign.nl/userfiles/file/zejigun.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/73103636126.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+imperial+eggs
    • 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_off0000e56d.bin
fdfbf2fdc87481856cdd6e98b303492ef39a5a9301635a8a34b77d2d84b976f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 16784 bytes
font_01_sfnt_off00011119.bin
b1b7ea0599e90475496b0a51423b31d33b016d36ea7b8842f499f0cecb1b621c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 10340 bytes
font_02_sfnt_off0001285c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 16792 bytes