Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4bb82bc9ba18c5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 21:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26d7f1de71e3961cd60b2dce2ab19fe4 SHA-1: a3ac90151ece6a55be8b7eecaf6ad7b065f178b8 SHA-256: 6a4bb82bc9ba18c5e96fb516a47f8fe9d5284cedf47f0ab880a98262ee94f6d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://dui-antidote.net/images/userfiles/file/94477978514.pdf In PDF document text
    • http://gcsiva.com/files/userfiles/file/83505098416.pdfIn PDF document text
    • http://mariancozma.com/_user/file/debemuwigarazajuxubila.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wobukavezidiparupipuvu.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/rezopo.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/40460745329.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jemugujesovu.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/86260874386.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/23158271242.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/19166688053.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/89315892982.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/96607714546.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/35774044281.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136694d5d4c5---rikunaremulixesamitexu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/nokekazelovofukomowaju.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/rh9f7isu103k00r0oeb9gk1tm4/59799759302.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/27653219363.pdfIn PDF document text
    • https://telorgabus.com/contents/files/kajuvemigif.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vodisom.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146f226c9120---80351263458.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d046f570---64316887073.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/riwewozokexu.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/12093406508.pdfIn PDF document text
    • https://brakos.it/file/29339695541.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/7340319465.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pavenegoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=into+the+wild+warrior+cats+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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 17856 bytes
SHA-256: 18a002f8ca0ee2469fbb1193967810c8dcfc2a82fda24383a5b468a423b6b3e8
font_02_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 10756 bytes
SHA-256: 92e552134a62bb9d7f1b897a496a854749599a6cae45286c7af389900d16f350

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