Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47eeba7f7c3ca6b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 05:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d25222156e890458d9a87acc667fe310 SHA-1: 2b1b912082175f74ace0413e9dda3b9ee91406d1 SHA-256: b47eeba7f7c3ca6be26aafffc41404db42290d6df87201749a2b432afd9103a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=mesh+analysis+ac+circuit+problems+pdf PDF link annotation
    • https://rajakedua.com/contents//files/repoweti.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/2345239905.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de59da63bbf---80569992786.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1becbc05---tanomitapo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386650b6b3---26034330790.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/befogivunivitig.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e418c7c29---navazewunapat.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/11816258760.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/444228839792ecddc57f18ca36d173f0/wiratanabidegew.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/45bbde1ce83db2668f185e700c2a3f5d/12916448070.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/70447771152.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202179223885722.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d616ec14c5d9914d034bd3f26d378e19/turajijokiwupomobuki.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/14780708183.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fde699cbb84---sogidulaguletugafezalunun.pdfIn PDF document text
    • http://emaaravm.net/upload/files/xakuroxamibumibov.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/xadepelazolosakosaputoga.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/12508900324.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/58029597224.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nomekebebulubogonota.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210802120129.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/40868440602.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/81293871366.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_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 11232 bytes
SHA-256: 35c64d89e64f5373fc0315ff23331dc27c4053adeb5018611f1c3d5d9f2c9644
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 18748 bytes
SHA-256: 1d469b524023d49f124955ca3d1de258060b0514ff03a6596c88655bf5d53af2
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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