Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3021dbeba218ea2…

MALICIOUS

PDF

87.3 KB Created: 2021-07-06 21:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a66a2451f54d60b4de6fa6cc2a5e02f8 SHA-1: 8ee9aae9983e2696f5b935aa2770267517915c38 SHA-256: d3021dbeba218ea24bdbe9eeb026a9632c6fced90ae073c946a0fb4d0a9cbf78
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. The presence of 'utm_term=manual+search+engine+submission' suggests an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the link farm nature and use of compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=manual+search+engine+submission
    • https://bancodevida.com/bancodevida/admin/images/image/file/39228174389.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f26b979a---68968142834.pdf
    • http://sakem.org/userfiles/files/nejipox.pdf
    • http://energo-winstal.pl/userfiles/file/7644491614.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7b70ec40356e17461a60285c2a1f4cde/vobuxivalepekozakal.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nokmgqol13eo5p2ja2t6opg93a/bogebegefad.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b7297718908---vufunimejibixeraze.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/48572376783.pdf
    • http://sva-jeanroze.com/xmedia/file/38670694015.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/50875602706.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/07db9b7e552cb8224b22a77c09ae617e/32252884805.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706c196e253---rimukupib.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/vifawinakosopu.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ffd9adb25abfb035602d5e6af76a3452/97530972959.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d461bac0b.pdf
    • http://drprdesaihospital.com/uploads/90041481721.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082816d0a938---83532762057.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kl5rv8rehuk5g69ght36kd91aq/ganujutexivilutov.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cb96d527---jujogoni.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aed1046d9ca---nunudojotevapu.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1644432547---74509841461.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c30ba59d4---xirotenanaduma.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc7b82a65---36563926797.pdf
    • http://alexlunacoach.com/img/editor/file/rewibuli.pdf
    • https://aprilboya.com/userfiles/file/fopunikurewuxojebesusejad.pdf
    • http://crediramasrl.it/public/file/1802572742.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210606120053.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_off0000ef34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
font_01_sfnt_off00010746.bin
42d3b30d83078fed56bcd194560959a31d549c9aeaf2b30f1d1164ac6daef12b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 18172 bytes
font_02_sfnt_off000136f3.bin
5e86af22694b67397786ee068a1865c0c4c7627f81aa2ff2918266e09a68145e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 10812 bytes

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