Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdddb54a8cfee2c1…

MALICIOUS

PDF

67.5 KB Created: 2021-11-12 18:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a1b89cfdc84cd8e5d4d587378b6de72 SHA-1: 15c75a478db39b21799508361a2c740ca382d658 SHA-256: bdddb54a8cfee2c1a4f27d7f156fd925c77968558726170d1f2b653ac801fb48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://voxel-avocats.fr/uploads/file/ In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d7a32ff3eebfa00de5a1ffe0c148d6aa/56358634.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/tirubiradax.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/15454613405.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/rerexumubebelepuwujopexe.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/xubefapomosiletetotapaduw.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/10932617373.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/60613368762.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617e2d5752475---2159437876.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a0cfd02e5---tovazawonowosapiza.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/75790640254.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/77655888371.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/91794189419.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/71385336968.pdfIn PDF document text
    • https://halkum.rs/files/fufop.pdfIn PDF document text
    • https://magyaringatlanadatbazis.hu/dev/_user/file/61406641171.pdfIn PDF document text
    • http://automag.pl/userfiles/file/narabaribe.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/8266401906.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kevajaresigirid.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/97349235454.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/65658897905.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///pufume.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8eac256e---75717690443.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/vasubuvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=vital+signs+for+a+3+year+oldPDF 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_off0000a5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DF 10784 bytes
SHA-256: bc4a5700908eb573bb1972763a6c2ed7f99ddaeb99097e5bc83de9064ec5176d
font_01_sfnt_off0000beb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 16424 bytes
SHA-256: f92645b52617d5c49d4408020fda41ea8569d065da9e1033b11e8b9d16871236
font_02_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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