Malicious PDF — malware analysis report

Static analysis result for SHA-256 903b4fb244b8164c…

MALICIOUS

PDF

83.6 KB Created: 2021-10-07 19:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ade52edae1cbc72df9624f36243dcbfe SHA-1: 804b540910b2499ce2c19b8c6455ccf2b9bb4dfe SHA-256: 903b4fb244b8164c01c2149f2d7efab71072edb414086d82c750f2b36fc717d6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on potentially compromised or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to redirect users to malicious content or for SEO manipulation. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://primaneighbors.com/userimages/66414278769.pdf In PDF document text
    • https://illustrations.noche.fr/images/files/24333302477.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/datagawivivenekitem.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/95dd6dd505e3e00afa744839485c4855/popuf.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/87286256539.pdfIn PDF document text
    • http://mobilenmr.com/files/files/4180324581.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/9407250844.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/tirojumerulamuwitatukebag.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/xisizibetigubuf.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a5f2bf297---74963246038.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210923152445.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/gokerixifazibetamu.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210927_498EAB8A61ED418D.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109012138132779.pdfIn PDF document text
    • http://imi.vc/upload/files/40431560066.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/44995752163.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/gowajilojozekilixifa.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc85b688ca---wozevumogeboxes.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/wexikowagozaf.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/sokasupurawesakipibodo.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/21634610407.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/dojasasakafuwul.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/desonagatidubutetojowufat.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161528a38d6161---42176456385.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/65743362772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=upbraid+meaning+in+englishPDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10768 bytes
SHA-256: 9e0512372028788e01f74cdd4eb022c126ea3b0f6aaa790a663583efd89ceec8
font_02_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 20696 bytes
SHA-256: 4c543b0528f3d32ef9cef62dfa5ef9e01eca8d0dd0c03310dfd28d15c7c6a3b5

Open this report in the interactive analyzer, or submit your own file for analysis.