Malicious PDF — malware analysis report

Static analysis result for SHA-256 9388f196b2f65d64…

MALICIOUS

PDF

84.4 KB Created: 2021-07-05 01:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d11e66342661c8112c713426cb79e45a SHA-1: 1d17465d59cae054ca6fa5fbdea8032152c821bd SHA-256: 9388f196b2f65d648efce507aa2b5fc4ae84af408eb90ffc5492fc2ed4d3a6ed
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm hosted on compromised CMS uploads. The embedded URLs point to various domains, many of which are likely part of this link farm, suggesting an attempt to lure users to malicious or phishing content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc44878b00---63283228966.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/936085354609fb67d24b00.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/fukosebife.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/savedelig.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c0a34aec---sidulubawijux.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/nezosotobijuje.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/38862884223.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f72a6b47---1505534801.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2203a6de4e---45453387873.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac252ac215c---lapozuw.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/4219469690.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0e3f66081aa72f12c251215b0c867890/nonokub.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf7f6dde9---giruvabutededuxuva.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/fuzugefitavaruba.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/lapuvagafediru.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/bexepavesuzo.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/38073781141.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/198d4ddc70bc49b224dbb62410fb9e8e/wizebiwoxadi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50e213f0e---kuxonekif.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3fddd6ce6---31521510225.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/funamufulukipoxorem.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/kanegodifijagisuriguva.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/8362582585.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/jejiwasilupilodija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=splits+yoga+sequencePDF link annotation
    • 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 17076 bytes
SHA-256: a19177ee39058b264a200a52127f1652bf808b56ed253919726d6d6a4f209ff3
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 10884 bytes
SHA-256: 26d92093fcc0999ef195029d463ab1928b91b9c78b7d9eb1896bff092d9ad7c9