Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d69b80651c0c53c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 14:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a06ddf4ac554e8c26ddce27aa94ca5fd SHA-1: 14a4f042eee8a8041c9107738abf1aa9452f9aee SHA-256: 7d69b80651c0c53c1379ed2af21ff228ff9161d0f002fe7fc25c7996828a45b9
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which are hosted on WordPress installations using the Formcraft plugin for file uploads. This suggests the document is designed to redirect users to potentially malicious content or for SEO poisoning. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fa168b1---10304241.pdf
    • https://petpetmates.com/files/editor/file/62222593369.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/8344234757.pdf
    • http://massarentearchitettura.com/userfiles/files/23105529074.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613d85a60d83e---31771666960.pdf
    • https://alubiasdetolosa.com/files/galeria/files/wivudixavavabaw.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dfhtulciuggope676qg8oso663/wunaxikezujiguk.pdf
    • http://eg-connect.com/uploads/editorfiles/file///55595577127.pdf
    • http://riverla.vn/uploads/userfiles/file/44233397591.pdf
    • https://calienglish.com/ckfinder/images_store/files/bivefebosekan.pdf
    • http://centrons.com/uploaded/file/668868972614026ca9b871.pdf
    • https://tipresentoio.it/images/file/13820758532.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147a158dc4---jitosapulolozabeloxalejo.pdf
    • http://jingyilin.org/uploads/file/25089888181.pdf
    • http://shijijiaming.net/filespath/files/20210914092804.pdf
    • http://cuacuontoanthang.com/media/file/novijivugepedalusujul.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/filuvad.pdf
    • https://hongdung.vn/ckeditor/images/files/94717883856.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f5132ab8---45323098458.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/fisikaminoliwim.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/36307646029.pdf
    • https://oolong-dining-co.com/webroot/editor-uploads/files/79130999758.pdf
    • https://snapstudios.ca/userfiles/file/33908958743.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7c208be6---kolovivupumigatibelerelaj.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/35365066024.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411e7760451---ledesenomewetotutemo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cafeland+unlimited+cash+and+coins+hack
    • 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_off0000c8dd.bin
8c6c691c949167b6417dd6c5fffad704f68bc53d1edacfed6cece005fc26831c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 10864 bytes
font_01_sfnt_off0000e1c7.bin
21802903372445ae22ef865826326ba128249a160b8b7d2a2d50b0d7339af511
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 19136 bytes
font_02_sfnt_off000112f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 16792 bytes