Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca10f27cb2684fd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 05:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5b46b03a71f7845195016aca0728aad SHA-1: ba0f3921f63d17863bb0941db4fd527b6d940f85 SHA-256: 4ca10f27cb2684fdcb5044bea6c756d1ad240a13f83b2d54dc4f05171150e685
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or payload delivery, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://koma-brzeg.pl/userfiles/file/pinulakiwepozobi.pdf In PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/jumevatim.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nrrs1opav01q3fdogh996m1r69/77503571925.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pepipemigekufoko.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/54087529390.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/48165823070.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/6187996046.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/84aade4e9b1999c772540ccd90cb0cbf/saxuv.pdfIn PDF document text
    • http://pk.mo/userfiles/file/78155270777.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/gogav.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613654c229972---lalexo.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/xulikazalekamavu.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/pokotamikupepuginebuxakof.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/gosewovotesig.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6133949e2dffd.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/mokozobavaxatezatez.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/87074441400.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210914_A5A668CD369812E7.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/fofavaxumasefo.pdfIn PDF document text
    • http://yanartextil.com/firma/files/sekirede.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/delukegirag.pdfIn PDF document text
    • https://megashina24.ru/files/files/xiradasamurexemizatuxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=beyblade+burst+turbo+app+mod+apkPDF 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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 10856 bytes
SHA-256: e21ca725e523d469c953ec4d8bca72ccd49db5236cacec58cae573dc111037db
font_02_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 16000 bytes
SHA-256: 80097e1020bd50663718fb1101c05123467541150a1b021d592a71b6bb22931a

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