Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cfd0278ecb290a…

MALICIOUS

PDF

89.9 KB Created: 2021-07-24 06:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9df8f0d3b6bea34cb59d14fe9f2f2207 SHA-1: 1b3cecf96c61d5c73894f3204f592ea6703d0d48 SHA-256: e9cfd0278ecb290aaf27f06a43cba069f7560898046872d94ee648479a611b3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains hosting files within compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5f0e0b45---42478655360.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7450585e8d357ff3ffa61dbd012e805a/sifabaveriwosuni.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae887239142---duvudalimiterubaga.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a367296093---vifusirobotoravasuw.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/52850079824.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/72857031457.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f31e464ea4c525586db06e615989a89f/lefipaxotovigapatonu.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/36449015670.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3cf04816---lofuk.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5300c0887---samevegufazupufoverarojab.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad22ca04---bevasasirawituzikefaju.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/debtq1r3qtsglugeucu8lfieh6/56360071810.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/namiwikakorovijibere.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbed5d74bc---mubotabetit.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/pewiwadita.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/lagaxumax.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ntbs40a349v5sq2s8n8rtjo840/rifupixisejugub.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/71702670767.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/puxizosijutewiw.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/90351758755.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/74909170180.pdfIn PDF document text
    • http://topas.lt/userfiles/file/refuwufezijizubaw.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9c9fcd32da03a3793ad33f944bc2e627/kemunizovoxizove.pdfIn PDF document text
    • http://hotstamping.pl/files/file/lagolokibobuju.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740250802a2---tunikapil.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/bejipesevodogixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dise%C3%B1o+editorial+periodicos+y+revistas+yolanda+zappaterra+pdfPDF 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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 11060 bytes
SHA-256: 6eca9d9887e85d129c95bb65035192070f4b16090055a966b100723789aeab2a
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 20224 bytes
SHA-256: 2497f7bfd9e34c6ec89cbe9a13aa1cae878aa29402b5e944ccaf804bd41306c9
font_02_sfnt_off00013e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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