Malicious PDF — malware analysis report

Static analysis result for SHA-256 c400eb17cf5c664e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 01:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa67cd3d6e7b95c43e3227f24be6bad5 SHA-1: 050844395e171b67e7945fb9a8648d07d3bba306 SHA-256: c400eb17cf5c664e9c7b3438ea1cd8cd7896d72672946824d5b5bb849b65ad91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, exploiting the trust associated with legitimate-looking file paths.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=what+can+i+use+instead+of+borax+to+make+slime PDF link annotation
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1ac931532d643ca339b0cc2adde04781/mizezivisipopugililix.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607608702c4e0---93839076038.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d39d18c2---52194259904.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837fdef393d---38170161409.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/kafutuladaxul.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/12800387754.pdfIn PDF document text
    • http://skncn.com/u/files/4700335840.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6ba7c89c2d19565027a43244b4f043a2/nudazadakamixetakapamo.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/571572303.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74ed76fc2---39421500219.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/16974040528.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074611ac1da1---84249634841.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/70046728321.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/78890568614.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc976fe87---26989334863.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f644265037f982bdf84f7e43ac7c0b9/xojejegofitat.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7796def976b4ee3685e797cabc46766f/12590746029.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b50e68cc---xukodidadajisafexirexas.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a0173089---sabebajosokojexijusa.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ecc5abb24f8aca0245b664f23ac7351f/12044519459.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fb3ce4e3b---begezivesage.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tazapo.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/38946485995.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 17304 bytes
SHA-256: df0cf2b6f10816898e0fccd7becf06b45122af2476cb0dc745f152b20b634503
font_01_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 11168 bytes
SHA-256: c251d7662cfcd27afbced2373867975ddc0ec1b7ed7e543c1700a653f2385ea4

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