Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50540b77ebae373…

MALICIOUS

PDF

90.1 KB Created: 2021-09-08 19:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a939c6d2320b4f6b8aa9e20a7dd9d78d SHA-1: 06bd8ffee1d0e2926dba89c3eb3acc81d0776f0e SHA-256: e50540b77ebae3730d214062c94356baa136ecfffca45739377d67781aab347b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 6

  • 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.
  • 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://cahayaapi1.com/contents/files/sorejulojabokuf.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/46af2a339608bf36c5a06f6af41c9829/80835979282.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/89242829586.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/wafefoxesi.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/51309492504.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/radotasaz.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a6f2607d4c4115994cf7e3849d549300/25281294352.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/heivtuar19hb7vqdlimv79sevi/86474307743.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/zatunalobox.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/66526425420.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161322ab73608a---21986664868.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/jedowawaxuzej.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/58881794639.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210904044529266122sj9hy.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/disemidujovalixarinugev.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/dapaseda.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/kakitipixifawibavonaf.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138529d97427---winixesesapuwitapinar.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613820303bfab---vazilimuruwajezetad.pdfIn PDF document text
    • http://wdnederland.nl/file/59432304406.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/26681607937.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://delfosventures.com/userfiles/files/40953152554.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/pavufiwumowof.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/59895705851.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxisukejigake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=data+warehousing+and+data+mining+bca+notes+pdfPDF 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_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 19376 bytes
SHA-256: 941345f76ad1794f7a590414c57461d721db91b1c10fed3f740092da6b60e656
font_01_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 11348 bytes
SHA-256: 14f68aaf7bcd6a21cb1b6327f48d053e6d532bfef12e4859b5fe51e6562204d9
font_02_sfnt_off00014228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1