Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e538be8ec136720…

MALICIOUS

PDF

93.5 KB Created: 2021-06-15 17:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 99d31ef9f34473f315b2d5b19d4ad5aa SHA-1: 5c5e1b6176fe031d4e1c57525f0411e63ddaebc7 SHA-256: 6e538be8ec13672007a133128a3f3118a5a9050b5b1346dfbbc55305c86d4ccf
156 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the overall structure point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://coretry.ru/uplcv?utm_term=apex+legends+bunny+hop+macro PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/v9rqfj0c5vjvbvj8o61c9lc40e/zutofulajelezumapikusefa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78eec7b22---bugubazow.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/94276963574.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/61351195769.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9f068095c73c7af645c544ff5766d247/wumalixulelajuguzezojuxup.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b445744b99d---xewajavokidowujazo.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/58993193164.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e77d7e53f---40080011480.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a4465b26b55c09e7a5e0c40122e0cea/wazexuxasokevopinefezikuk.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/22282546143.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed092d37b---91313100304.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3a115e783---59984785742.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r5capgbh14hs7sgcp21q88osj5/fomugugemizuzogu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/5775911539.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d33a01d2a---31001353309.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bpkbsapsj7pj1fe3sv2guhu5s2/73998668558.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a331baa02b---55831774221.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/128183eb2cf438835c9009977650e4c1/litatudusufufalupur.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/42462881400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 6424 bytes
SHA-256: 50759c40df67ec181331d37bc16259f4db20c39507a2c7d18444f96545433770
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 5540 bytes
SHA-256: 6d7f0aeb2ed6c31dc53ffa2500c810d1594f2ee76ba50a99c622d7dfcaea699e
font_02_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 15560 bytes
SHA-256: df593ecf09cc5376e0cd205327566f1973e3af2fc1d3929d28c62625c6ed6876
font_03_sfnt_off00014351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14351 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_04_sfnt_off00015819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15819 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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