Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6d213d84088af9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 10:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15f03e82d8aa28d5b8883b3249212c1d SHA-1: 52d89b94c13da5ab04799bd9c6ba79e9e3f6405e SHA-256: ea6d213d84088af97d3cf9476882b7ce401ee907d892854e5ac6c9cda216860e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous external URIs and the compromised CMS upload links indicate a likely distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f20f5841d0---13165537169.pdf In PDF document text
    • https://sindonis.com/userfiles/file/74845950604.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3u2mo8ai7044trfa9rleuucgs7/55543933927.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/mugimigofaxulimom.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/rivixag.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf77ea2f19---newil.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160914c902cbf6---97894910007.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89521825730.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/47373442237.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/89533610834.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/44398814321.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/84779681238.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/jab5oqogkvkmka6kost76pemh7/nugenerugapabuvofifuje.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e53b34bb0---16786574659.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/37177061117.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/belavapox.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/vuwumupez.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0938c901---wegimukulamutonafo.pdfIn PDF document text
    • http://short-story.ru/upload/file/75245902594.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/11105bb8669a4bced58de42765af0241/xobijazovabudi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191ce4b420d---16766994910.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/2ae4b54efbace72cc9b1c8bc557a6a9f/21884654599.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/lirubozezosojenupuvowor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=extended+side+charging+handlePDF 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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 10616 bytes
SHA-256: c25e47aafe70322b55c8112e39e8c7428ee279b79087996c66df66972a0c2baf
font_02_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 17008 bytes
SHA-256: e274fa3be17f946bceb8cdca4a357aa0ebe6b21224c9b58616bd5a57f6e07254

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