Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9ed6cf76350ef3…

MALICIOUS

PDF

91.4 KB Created: 2021-08-10 16:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ea747f5e2584418223c63d95d309d37 SHA-1: 1687ff806a0fd86626614275992666015cf27cef SHA-256: ce9ed6cf76350ef31454006a1ecb3d8487565edff9a079f75ca370964fed3480
204 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a lure, potentially for phishing or malware delivery, by presenting itself as an invoice or payment-related document and instructing the user to handle a password-protected archive. Several URLs point to compromised CMS upload directories, likely hosting the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e19a022a2ba14a9965e7feba7056300a/60344590538.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/72506505101.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754197b0e32---698381280.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079958bdc096---46225016653.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4db3c594---9771354360.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5256091c9---sorumogosaxidasosowow.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cd382263ae091da29411b34cb18b4319/85769332170.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/fazumesidurejetaderux.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e3e38c7bf6841a3c26241d0a0239096c/lekiwigagigaxanipojuzit.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/70934075231.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/julotugilorobabukexiwo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e027d6a50---63123071397.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/75131040338.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/gusitobinunosu.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/86709256125.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a405c5e18---fipufusaxezuzopawogonud.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jimasejew.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ebca36e0---duwanapidobekawigoz.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/luwuzebigiwadez.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/94448996311.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/vozekirojijunirogapozor.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d5e5cae4f---14713060125.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e948c516ad---fejovarijipolof.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b783259967---4424506901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=acceso+a+usuario+uasd+nuevo+ingresoPDF 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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 10548 bytes
SHA-256: 7d666f64f26637810130e134af3a4a5b80b63ddfe022d0747adfc016517a6047
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 20308 bytes
SHA-256: b13458fd9dc234e2bd20fbcc5046a1f708b527bd5392f5a2eb474b8f468ecb55

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