Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99095c9fa961fb2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 20:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 349ef695a64c4dfd673a737babce61b1 SHA-1: 03e7dd0a6b57cf5c4bc9cf9d095bc8b1fb29ebfa SHA-256: d99095c9fa961fb27394a94e11dff8ece7cb6e8afe3787f2edd182bccf20bda2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, which is likely used to redirect the user to external URLs. The heuristics indicate the PDF acts as a link farm, pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The embedded JavaScript is a common technique for exploiting vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=calculus+early+transcendentals+6th+edition+pdf PDF link annotation
    • http://sea-cruise.ru/ckfinder/userfiles/files/xedonakibunanaj.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/jufetitefifilosedexig.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090906380411.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2b3961b5---kokuvapame.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/45655311176.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/boxoniwodagopugerosa.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/77953354797.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/61354314172.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/2928097707.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lazupapinimawikadur.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210920_FE60B557E2DCC618.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210907003755.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/53355160614.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/44057225802.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/26367742212.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/fojavuzebobirosu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448c59e629f---kuvema.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/sobiligimisozojen.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/98394533791.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/73437932293.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/dabukorimanir.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/16088562791.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614008cc4874e---zabilopugi.pdfIn PDF document text
    • http://netart.hu/userfiles/file/riwedopagekizefaz.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_off0000b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 16004 bytes
SHA-256: 0f9f0684e5b2b3585deb480c8ff101ec460efefcbe7c7083e6f17906a3ff241e
font_01_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 11132 bytes
SHA-256: 037ba11d8f133c102133890055c0ca51ff9210fcc5b30a07ec23503477b2124c

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