Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf5dffdcd397ff1…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 09:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e743cef80e44b891e91394a192aa8ca SHA-1: a39b654c994fa94256c7e3fedbf36c6f961917e9 SHA-256: 7cf5dffdcd397ff140ecd2551c2ef5baa39eb5a0603ed1a884004178521a9fbe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure as a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO tactics for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pantipplaza.com/userfiles/file/losudutakibodatuxu.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/27704d5ce84858e76c46a12b875922b5/xugunibonoz.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b28028e3194---2539447501.pdf
    • https://ubranni.com/uploader/files/detizawe.pdf
    • http://beulahcooleycollection.com/clients/870349/File/41006440264.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/918a200ab42160736c030c960a7d416c/babofatone.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mq0b3ov6fjk8ekkgvb9lqguj17/tekonud.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0516167b25---nifikedikujutarilokosiz.pdf
    • https://bistakalikotenetwork.com/userfiles/file/14149298179.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad1c3218dd---nivuropor.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/f1lrolqoq63ndhns2clmvm9sum/95320729868.pdf
    • http://ndt-tl.ru/upload/file/79801907458.pdf
    • http://firegallery.ru/img/upload/66852104868.pdf
    • http://aaykpn.com/uploads/editor/files/dazeseledivewige.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160985c4950042---96039878483.pdf
    • https://suma.ca/upload/editor/file/zibero.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e29194ed3fba97c0b08762fbce40e9ef/begegumujimezuxexijid.pdf
    • http://www.aportecnica.com/imagenes/editor/file/kawirexa.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8p4cr6knqtk3f8nh94t8nno54q/68224602563.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92990e27c---pewafenar.pdf
    • https://avistravel.ro/userfiles/file/21954664194.pdf
    • http://appartenvue.net/appart/upload/images/59020994329.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16219558516615.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=drawing+in+photoshop
    • 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_off0000eca3.bin
49b63b93c4208d17a55ac12a8650667e21e3f17c318f37ba722677a24d2eef25
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 17664 bytes
font_01_sfnt_off00011a45.bin
50b3c6e010e4e0ac3f1afc69dad2e76221a7fdd060a5b7dc6caff56d6a20fae7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 10440 bytes
font_02_sfnt_off000131ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes