Malicious PDF — malware analysis report

Static analysis result for SHA-256 984027de14242e51…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 12:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4dcf8f461397efec20ffeaceacb6ed32 SHA-1: 4d67ba4fb228490791dc43d67a60c67ae8223378 SHA-256: 984027de14242e5111a07ed5fa0000ee5142f4beb5048124c307c74526184682
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to exploit user trust or curiosity, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676a8e82e0---fisuwelujijobater.pdf In PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/laxazeruzunukusobepopi.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/83253618589.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210914133047.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132531d50439---45171055796.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/kunimaxetatazelenazi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf64d825a7---30064696334.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/8659022096144e84a27249.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/58677905233.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/83162939470.pdfIn PDF document text
    • http://mfcpavpos.ru/file/sivajogixojogajuxabov.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/63dko0kfuv1v50p416i7km8113/19445382103.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614212a764917---waxejulipiwuvorumam.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49392326210.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/pudulomavakumuduvigu.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/tuvepotebukajonabiwazavo.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/zuropakigojipel.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/86813345385.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614762ab91867---74419700865.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/14265470369.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/68566728447.pdfIn PDF document text
    • http://k1a.ru/images/files/file/6436883560.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/dumowipejoge.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3ed1c79a---jefasoj.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/31541252936.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/68404069759.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/62397682722.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/xokatakufinesenawiborozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ms+dhoni+untold+story+game+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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 17744 bytes
SHA-256: 00a5f5d9561e2cf2fae83a6f981319922ac6c5ab626d299c5d95e933dd2196f9
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 11140 bytes
SHA-256: b9221fd329bdcf930e8022b5eb3d9884e4cdc34b562f497f37abc378731a3a6f

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