Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8edefc97a59c2f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 05:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99252855c5a75bc74c7e72aa47b52b2b SHA-1: 80698e110685e6aafbae8772c30fc4cdfdd3fe81 SHA-256: 3c8edefc97a59c2fac1c4fd42e56f5a027110e5e6940f1c234c900b31db60388
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=cochlear+limited+annual+report+2018+pdf PDF link annotation
    • http://mytmbc.org/fckimage/file/93486604396.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d1fada7037be57f415142345d9ccc6de/korinematanodojudagip.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce0696bdd---vazikopokaxoraviteme.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dbaefdcf218f5192846a1160c3018e75/58901053125.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/xaritotufegepelubixifefir.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075803807198---63484882000.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021081818334916.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/66840815139.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8bf20ad6---fivewuwuxiwivewuzud.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac689c3a213---65262879851.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/simaj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4370cf2a---forimaterubapojakosezis.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/giluzaregesetaloxenabiv.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/92365891640.pdfIn PDF document text
    • http://kunbot.com/upload/files/6505797496.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/tujaz.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/junik.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/gutodiwukefuxatov.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/pijaguxajodogiwugonapogiv.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/tovolovufanetugade.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7c127243cf88d0400bd989b512c79833/2137709564.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f8e5b22eb1fbcfa3fec597879f72e81e/82356571530.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/46619455909.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/27299038000.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c52ac01e6---jesololisuwifugore.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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 11352 bytes
SHA-256: 0b6b1c6a1d930775ab9298a813fabd06d161a0aa86bad240487ddf587f367e47
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 18472 bytes
SHA-256: 00dea539e477285ac5f72d73561a3c09e350af7c3c79d1f316fe6eda76e7cddc
font_02_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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