Malicious PDF — malware analysis report

Static analysis result for SHA-256 b265bd377609782d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 07:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93170c1d6e8c70f65d14827e48119763 SHA-1: 4b08777d9dd825d1a16dd905e9bcd565cc2b4d79 SHA-256: b265bd377609782df7a3ffeb9d6e54eb2c8c1bcc10e62f8160a020463b0261b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on various hosts, suggesting an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=lulubox+download+iphone PDF link annotation
    • http://kanchanaspa.com/ckfinder/userfiles/files/rirul.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/newasuputok.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6bbc9fb3e0069d8e6fa87b352a904c8b/jakadixerosulatimuvuvok.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/7267790119.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mutelimofadesalipanu.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/24321985238.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/86760479523.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/25217058179.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161445315e18da---namesexowidefal.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210915210550.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/xiwakebenudufudarorin.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210903074211_emss71.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/wituravesijaxugem.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/56121834013.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/67288479529.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/53760764373.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/abd6b13883a9ef281f55623637dfc516/wexamudufujalu.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/bunifufivojuwis.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/dirisatasonazozuvuwiduvew.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/wijiwasameroxoposede.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/29133070000.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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 10508 bytes
SHA-256: 7db7d3aacf81f2f54c1161e4c9a1e207de59519729936425ba31fd97e329881c
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 18280 bytes
SHA-256: a04319a01d0aa08d68bebfdc5b2dfc7fa63ad8f6c4565010ca48dd2b8c33a28a

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