Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5d726450dc7672…

MALICIOUS

PDF

99.1 KB Created: 2021-07-14 03:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf11bff608efae41228135fbb4b74c84 SHA-1: adbcf497e0daf750d88671b12696f107271738f5 SHA-256: 1e5d726450dc767261668d1cdcad8df5230542503b7f9084e53289ddcfcba503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=what+is+a+navel PDF link annotation
    • http://zerosquareonline.com/file/21650191186.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7d795a1200faf30cc221c2612f6a1f47/39063226602.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a65453c4b---61672498894.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4b7576d663f60240965b062f5691f487/kokifupojanetivi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39785f2c3---xuxofalatomepufelenunekin.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ce9755bb---poweruraw.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/cjb66q5eoenqpihs9ff4aj59gs/visubuwizinesorakenanozut.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8a029ec31b243cedf1d8b832084bdf0c/mufetupoximepub.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/0d68a2756bce22a2bebb62914aa607c8/91571753367.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/vefexaroteporudaloko.pdfIn PDF document text
    • http://93564497.com/userfiles/50531328274.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b733e5e18e5d9d37000ac50b303f839e/9210600522.pdfIn PDF document text
    • http://christopherdallo.com/file/9497437010.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8000dfe67---xipinewozuvofufitewa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160858ee770206---zizomokodomi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e24f9a3eaec01fe4d1e26a80197b8dbe/3083280383.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/72d9c3202a19655c0e54c53811e33e07/javivanox.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/23ec0a6c67fc9b73d4409d03c3e98170/tegizakovaw.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/pupuzisidowedito.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc8ff34ed4---24065836950.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zozesuzazivori.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/uul45jik881dq6q754nvvdk5tf/19363378279.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/nobivez.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
font_00_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 10044 bytes
SHA-256: f371e750b346ab9fec7c10015787efbb14492a27debbda066f867a835ed7c0b8
font_01_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13700 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_03_sfnt_off00014c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0F 19968 bytes
SHA-256: 7db2f5a3c1e0b9a2fe34b10c6a297cf0f3ac238270aef7cf7103d84b37a8cc97

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