Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9969664ed9d163…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 14:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d9fc235e08b62cbb3c203a7b8a25388 SHA-1: 8014a94135bb8d31f65af62ce00f100dcf611b8e SHA-256: ea9969664ed9d163d1040bb3022d852266f3b20b127c71f7ab90f11539a6d639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf24c68b9---72678312685.pdf
    • https://aneri12.eu/res/file/xesowiketisumatuj.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9aac2e2a---56246774527.pdf
    • https://ludifrance.fr/userfiles/file/85142714860.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2d6e5dc24---58989165164.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/m615qgjqhpjm5oe1gqc9a10hlp/65583221176.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f02c88af7d78c3c8b9a5dc91320d4beb/60293167051.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e65b958c---pibudavixomolofubezezuw.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe533f18f0---45128972633.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0adbdad3ec0047878f983aa54a3a56cc/jesidotonibezi.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fg4baqh3e07g9nlrfom5ivee4d/nokelewunumirovid.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/t5gr3vmo95al5hurge6du1vim5/3659569.pdf
    • http://flagrant-desir.com/userfiles/file/lubururexagoxano.pdf
    • https://anmoul.com/userfiles/file/putasarubajatoriforakub.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/74948128646.pdf
    • https://arvikabc.com/images/uploadedimages/file/91176940730.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/65868578131.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c830vsu0c3m8vrle2s8v2fvo0c/getajasuvidemavufafomidud.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071938e526b7---xenepinazagores.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c28a1c2051c---xipibovojebiguvoripagiva.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3451651564178368253aea31e542c814/29150610020.pdf
    • https://africanresearchcenter.com/userfiles/file/nuzutadurojogozudaras.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f74ca77d---nirixarozobabuwelenej.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775d557f7bd---34298701349.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jgc6br8fju324frmh5jf59luk6/77202711178.pdf
    • http://jtour.vn/userfiles/file/gubonoxekenatatilukel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=amicus+brief+template+word
    • 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_off0000f57a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
font_01_sfnt_off00010d8c.bin
08d6becf8478f0497ced6ca1a77f10721d70f2417972fe6478d8a1f09f35d6e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16860 bytes
font_02_sfnt_off00013986.bin
4630cedb9e03802c23ee51156c53712dc7d1138e9ea541ba89ae301ed233b2d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 10984 bytes