Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67d9308dadc6443…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 00:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 695707ac16f237d1fd62d2e296c43f49 SHA-1: 9f722325e21969aaadc7343adaef23a1c479ee67 SHA-256: f67d9308dadc64432f2bcac60eca740465426f08b24abfb465a488602f4bfb5c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites, possibly as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=veterans+benefits+manual+2015+pdf PDF link annotation
    • https://alteanetworks.fr/img/file/bugagozunefarenureza.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92200606013.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5804cc9320db167554abe779d365c42f/moruzamufiko.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/17269188169.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46ae74371---52915241885.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/beromola.pdfIn PDF document text
    • http://shosholoza.de/file/95694492105.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/53942025697.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/071ec6b17ca28ea3ea8433541a4c00ae/72986968580.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/32905075007.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608630da1a719---delekutewasixagopuxoguxox.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/jatitasusalegedo.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/55410599385.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/92784521914.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c6c9da78d2d9383b61b25bee3437b651/89491820747.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a96672ee6ed---81497164298.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/2407501134.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/83701695119.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/27150717600.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/35617791419.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/56441165168.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/zujafowabefiwefa.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2b6d7b72b3e75411efd234ae30a41578/sezarawiseke.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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 17144 bytes
SHA-256: c9a5b35254b39a7c52fd123177c5857db3fa53606df31ad7f2af5f345b09dccc
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 11176 bytes
SHA-256: 4ed987c1efb41cf4261651b65db5e3169ceb158551c137d142f8fbab63cdaf73