Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70d0fd1fba679e2…

MALICIOUS

PDF

78.1 KB Created: 2021-06-26 05:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ad6f3b7faf0d3821c5f5f59ed05625a SHA-1: 9e3c9e4f5b60bea12a1fb457e781a73491c7d72f SHA-256: c70d0fd1fba679e2a61ea588a8f2bfc2c2beb727e1e2a70c7dd030cfc72fd770
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pistant.ru/uplcv?utm_term=convert+word+to+pdf+1mb
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/7740812725.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed19e0893---8233257686.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160760dbb61053---69421091157.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/nukovurisoj.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6079a4cb5852e594439112d7115d1117/tadenizudebiz.pdf
    • http://beiwendq.com/userfiles/file/marulapajaz.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/13467032281.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1a5a88ca7d703991fb09e90f2f66bee7/17086133413.pdf
    • http://beergolfers.com./blog/images/file/18694858392.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/18504ef39a9c09d904c56e994a836a38/dewimu.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6bfe48075d549a4d210f8021d9dfc121/10474758849.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/tofawajutewedaboxov.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b202d77dd61---27309210385.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105210444342456.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/bugedufotigunibivobisera.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/904103705bd169bb28d8732497495542/novalefejewitaza.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e9343f0b22f215a3333dcf0069c566f4/pezumasa.pdf
    • http://abnicum.com/files/file/regetazikukikag.pdf
    • http://asiadomainstore.com/userfiles/file/10695141772.pdf
    • http://4bx.pl/public/file/65879303740.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e676ba2e8c---votazosigidomaku.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0ad290f40bbfa7d79cfb8b6734285c90/bivumaluzuditopawika.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a663acec886---80081929582.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6a.bin
b76074d324b0f79bf5200e718d7d5fbcc5eae09c197ff7fd7aabf7e32e3d8641
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 16836 bytes
font_01_sfnt_off0000fb42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 16792 bytes
font_02_sfnt_off00011359.bin
102cae875ae59d2f6f18554b3390e0ecb8fe9d987f35a91d56f57f99621e4365
pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 10568 bytes