Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e6bd88bdc20c30…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 23:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a3b675df0737dbdffabfd457c2dac29 SHA-1: cf608e0a11494afcc7b463c079c060ba496ec9db SHA-256: 05e6bd88bdc20c308153e13983a5d860982d549551fccfe134327fda13e69a81
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic firings indicate the PDF is a link farm pointing to compromised upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of a PDF viewer vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://envigest.cz/upload/file/39838704509.pdf In PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/50177305233.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zamoxijivixobilo.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/fuvoluzoguvupinizikezu.pdfIn PDF document text
    • http://turnyras.lt/Files/file/93487069616.pdfIn PDF document text
    • http://interconformity.ro/images/file/jixogitavun.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/77845946653.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jaxugotasi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613143c3b0fab---31386665944.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/93462755676.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/40858704968.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/83599636212.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/dusurojifavugufewu.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/30298827618.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pujexatowufinifonafutoli.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9443e9740---rikatitezunupuzimo.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/finodumitakejunipi.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/35109895932.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161408ed405a26---wijeruweve.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021102185365238.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/xolixuxexasa.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zufusuxidigaxuwosaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=american+bully+poodle+mixPDF 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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 16480 bytes
SHA-256: 79bf61afa349279e66f94293c341fc3fa2a6b85055a11c8ae08adec5e88a6748
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10848 bytes
SHA-256: c9f5b7a618a5dec22510cb1f85aaeff234b3caa948d8e2a9e25f4637d2043a3a

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