Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ed6be8ac2c5466…

MALICIOUS

PDF

83.9 KB Created: 2021-07-06 21:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c67e6a518c88ae6b19b6392a7c169319 SHA-1: 4cb5644cccc94e8ccf3f9aeeefdb9e9a27c9fe73 SHA-256: e9ed6be8ac2c5466c80e34dc865a6df887f9c6dee5fa158145b2aa31b8b9b91d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms and disposable domains, designed to redirect users to malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate the download of a second-stage payload. While no scripts were directly extracted, the PDF structure and URI heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://yuanjen.com/ckfinder/userfiles/files/31192589243.pdf
    • http://157.230.241.115/image/upload/File/wujumalenu.pdf
    • https://circolodelpistone.ch/userfiles/file/nufawimegomuseserini.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2f7dcb00e86eaf02529625d3c0d80010/41019140374.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77841195b---jidiradavisefimemexa.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779063b2c10---nilinonerade.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f262ff3dc3ee770b4c1d0b48566aff54/sipipidonerosivok.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3f70caadd---buxuzam.pdf
    • https://hanahana.vn/media/ftp/file/rufeza.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3tt13nr9n181cds00c2jelao42/rovegixamesagoxalinidira.pdf
    • http://katyababash.com/images/uploads/file/dozavugapuroximu.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd372da75---22287051753.pdf
    • https://osikovo.eu/webroot/img/content/files/69966842110.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fa778d0671d7a7574d47571250a57bfc/vutorubuxijalatixizuxu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7092e297b23067b69b58af61abd8422e/sesinuzojoperexizovem.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e9f576d598bdf454f54dd7b1dc1213a4/xerokinapisererofotiteko.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35d586b91---36523225543.pdf
    • https://tramtron.vn/uploads/files/files/76541707318.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f65edf6741fb6ca7645fc0c4bc4dff39/76003164158.pdf
    • http://pune-india.info/userfiles/file/zakafutubivil.pdf
    • http://thepnguyentran.com/media/ftp/file/tadefebos.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28461be15---fajaw.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608201c130aa0---55585758508.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f54ba9fb---gupopafinopimivelego.pdf
    • http://roxburyhs1987.com/clients/63080/File/54554107826.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8tco0qkd5q66rnmap4m55emq01/zevirerasuwumofolefolof.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c95e955f0---54770424247.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+resources+for+family+medicine+shelf
    • 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_off0000e180.bin
ffd6c23d0854ead5bd6afe5a52139987e63a2ddaeb85947cfd891b279db2f819		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 11008 bytes
font_01_sfnt_off0000faf1.bin
174a2dcd8a822cbf53566330140066c7959b4657256832d8b7a48dcb57264187		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 17956 bytes
font_02_sfnt_off0001299a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 16792 bytes

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