Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f366054fc74926e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 21:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ebcd6eb8d57ece4d2066d330264d6b3 SHA-1: d451421cf5d0b061eab1322f347e7a05b2a81f12 SHA-256: 4f366054fc74926e7bf4a1607f4742eb602a48700744f2eb2df5463a18bfdfdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users to malicious sites. The numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=structured+observation+in+research+pdf PDF link annotation
    • http://alexandraharris.com/clients/36054/File/76727141423.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/98167392942.pdfIn PDF document text
    • https://bauarch.bg/files/rilebupama.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0c0f0f96---wimekapixumekisaj.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/2112889382.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/75517460154.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3446fdeeb4c4c9cced8bd1c259a973b6/98263418604.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb6e848cda---zesijaluxevejanexa.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/53517113856.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/wasowelogegafozo.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/19996948513.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jawuv.pdfIn PDF document text
    • http://go-forum.cn/upload/files/vevaxowotoki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2cddc9f75---raturajedisi.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/lorasoba.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/28810733167.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/70342231036.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/68990530642.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/617357156267607413f46a6a9d0ef218/26717172680.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/mirenomuvikedonopoj.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/sigubuwavasuj.pdfIn PDF document text
    • http://contelex.it/userfiles/files/9611771186.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/be77b60dd5a858fc1900db1416630086/99276513600.pdfIn PDF document text
    • https://avela.md/userfiles/file/60436762804.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001067e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1067E 17652 bytes
SHA-256: 7d4225ea59698d60483d3e0c673ca4e1b1e11637d7c427ae65e62186574ff4a8
font_00_sfnt_off0000bf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9F 17704 bytes
SHA-256: 3bf8f68679dd3e7557488a5e12cd20a5a8d3577f991e851ffb410548f43bb827
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 11052 bytes
SHA-256: d1155d3f1cf18361beabf486ffd92ab46af86bcaeabbd369950b44b6bf404df4
font_03_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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