Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7796eca26f33f37…

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 21:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edfd50ab8a7dd7bbbaa48018c7cb5c35 SHA-1: aefc0a9d6325ad3544561f5a599d6d8a7b1c5fe5 SHA-256: f7796eca26f33f378c4babcefdf4f167d91d6973479fb07d5d61a3d46d53d264
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or SEO poisoning campaign. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=pathophysiology+of+tuberculosis+pdf PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08930545e---pivijodijukajiziwekubusol.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4b7ca776aff65e7ca06b0d2b655604c5/gixoku.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8e4ed1cb---naguluw.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/h50rqni05t9vbik8lmndh66kp4/61149119329.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/55107854890.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/29bbb231e15c47431e28985550083a5c/nasoza.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/22386956153.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0b939756fcbbb3d7b7cbc67b6ea2248d/13969999955.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/1ifn6n246d8g8bq7qpf79336h9/94082015720.pdfIn PDF document text
    • http://tipiland.net/upload/file/78105448068.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/11mfglpho91detp1b08dh05ui5/99811852177.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9d16923cebd23b1df77c96b8421eaac1/56379560053.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1tcn9cuvtaa7v6cfttgo1qv30g/tokabu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/55b75b8e44318998dc87f4635636dc3a/jipubuvunijalibiranir.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/190472dda47649fc14768cab2622403f/95802656697.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd0d71177---74763606919.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/92637587677.pdfIn PDF document text
    • http://valeneighbors.com/userimages/vufulopojudojexudaxifib.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4c8d46cf---54917939123.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ce499758205f842793ed4dddda5b06c7/poret.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3da4eabc---desosul.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/79739717662.pdfIn PDF document text
    • 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_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 16688 bytes
SHA-256: 860a43e43317e7e851bdcd43a36800ab91f5c4bbc0d3862de77153a1be42ed61
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 11152 bytes
SHA-256: e7fde6b65fb3e58405e71d7fd20f807a4e15967160342535bd348be25499fa62
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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