Malicious PDF — malware analysis report

Static analysis result for SHA-256 084bac53f41b05eb…

MALICIOUS

PDF

88.1 KB Created: 2021-08-11 03:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b835f883659df8d2d583a6f269ffda1 SHA-1: e47d3b2ffeb3a00e998b131ca222a04f78c3fd2a SHA-256: 084bac53f41b05eb1faab1ace332fabbd439fdb092b5a22b86e312ef0a0bdc7f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the PDF structure strongly suggest it's used as a delivery mechanism for further malicious activity, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=propiedades+de+la+radicacion+de+numeros+racionales+ejercicios+resueltos PDF link annotation
    • http://ural-resyrs.ru/data/file/10356722281.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/goguluxalowiburejime.pdfIn PDF document text
    • https://latework.cz/soubory/kegasose.pdfIn PDF document text
    • https://digireg.es/upload/riwawanotevuzapoxitutov.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/80168119048.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/3560943346.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lumenebogoxabofezab.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a39020d4---kapimomutonakejegijujede.pdfIn PDF document text
    • http://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/38861246613.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/noranak.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/59c93831bc5ff714be46cef7c6f22e1d/fudazewunajus.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/feduluwijisimenamajobuxun.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/kezegiv.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5aa8f430cb5b9be0deebb1cb3fc72869/ragonurewidezepowalefubax.pdfIn PDF document text
    • http://kfbi.ru/content/file/zafomejuwe.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d919460d9b2---36965013784.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb71e4bd74---22970751105.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e55d8a3c46d---33161767294.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/24146514095.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160974d4683a98---47295873922.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68023561995.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/96723127628.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df108f45c---besetobaxarewedawanokoje.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_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 19764 bytes
SHA-256: f35b88a370352f5e2a309556e8fdddc72f74c94a5c8e7cc683484cbcc5bf1f98
font_01_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 10908 bytes
SHA-256: b2f901f69330dca2a6aaa4365607eb1138e9e136809449967a53e1dfc17f9f78
font_02_sfnt_off00013804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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