Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d958750db3e1436…

MALICIOUS

PDF

92.8 KB Created: 2021-06-27 18:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61236074904f352b0af52406ce7818e3 SHA-1: e44e43046c3e4e021e7f5dac6dd899fc7f4a27fd SHA-256: 9d958750db3e14360c4c8304e7986bef818d931447c9734c0cd91fe125492a6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate that the PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://coretry.ru/uplcv?utm_term=trade+based+money+laundering+examples
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/4sdndbm324taik2ne12qbefmm0/15594208587.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/da130de3fba04d8f0a28db3bcde850bd/felaxurufekixuboximitaf.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0737726b34---vamafisolejiwo.pdf
    • http://skincarebylaura.com/clients/862251/File/xofewa.pdf
    • http://www.anjhimayath.com/upload/file/juvezebiwidajeg.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf89c8b5f---84275917923.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160caf5bc9a2cd---30620665067.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/05d638997def2deaced2756715cf9023/66527864191.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7tk0309s3ovh80l6rakcdbpoj1/47922101369.pdf
    • http://www.cbs-emballages.com/upload/file/51514797123.pdf
    • https://xanbiente.de/userfiles/file/49559565725.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cc4d8f03aaee487ae90d02c2641c49c3/54800173759.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5796761e---21927667827.pdf
    • http://hotelbelleepoque.bg/userfiles/file/35794328966.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/36f552497410ac3797875ebd4e28147f/dijerimekefu.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/df28ba1f60acc3099447365f94095a99/kanatubojamepiwuva.pdf
    • https://alutat.com/data/file/gosofeg.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/96207996fd8d087848a1a332e0d93c27/vexevojubo.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983f6cd67aa---78831337941.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e9fbc457ab38b3b4d1e3aa8ddeaf7af6/12829204523.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c89e55dec---bivifawi.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a983dd8b722---mimiwefewulez.pdf
    • http://fxmeat.com/upload/file/0e57d18deea430211074af25db436b45.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/31382339522.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_off0001066f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 16792 bytes
font_01_sfnt_off00011e81.bin
2f28210bde47dd3540e44c9a386c5e55a834a997cda90f17691609bfd785f43c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 17536 bytes
font_02_sfnt_off00014ca3.bin
76bb803e39ebe2715bc42d81403268d80f3567f4ae0ecc057eb99152919d40fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA3 11056 bytes