Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea249624891801a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 16:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e34a60c406664b62f547a80dee38518e SHA-1: 28ef7df4ddc84fafaca219bdb98a1bbd5c2e34e9 SHA-256: 7ea249624891801a18615119e6cce649c8448c7d93c44953c4af6121093c7202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=navegadores+mais+rapidos+para+android PDF link annotation
    • https://walnutcreekguide.com/wysiwygfiles/file/limoxewa.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb4056f39---72567205026.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7bf207f6---85358254574.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/baru3ju2b78dcheclipnpn5oek/bopetuwebomifomimusaxib.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/6879035999.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/fosomimivof.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/didetizikirijutoko.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136727a33a48---nozes.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/bufikenebat.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tixidawodidurejazigi.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/gakimalitogegejezurasimut.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/61447459289.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6b24901d---sotofafezegezudobo.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xurudesufafedaki.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/4254768999.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/wizijezuvoponavef.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161365ae48498d---19446254320.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613284c8d567d---puxawibopinisatu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/suruwinux.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/22653703738.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137774c6622b---2935186741.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/95356228537.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/75292969126.pdfIn PDF document text
    • 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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 10632 bytes
SHA-256: f9a47d0517ff69b4b723b034a81cfdbb2cc0cc984b5eaca8deeb912490a72d89
font_01_sfnt_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 19240 bytes
SHA-256: 3bf78039dffdfdbe7eae2e515d0a5e29edd575dd759085b98b63868df8820129
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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