Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5042f8f6cd890b2…

MALICIOUS

PDF

85.5 KB Created: 2021-10-11 04:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3334b834d5005ce9459325783fbce2f7 SHA-1: 47ad2aec08459082bf4462b24b0143b5ed73e4e4 SHA-256: e5042f8f6cd890b27e295d54ae956f22b62f7edaa68b5c2fb6d88334c2264dad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) and the overall nature of the file as a potential phishing lure delivered as an attachment (T1566.001) are the primary indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mobiliteit.nu/files/39015555054.pdf In PDF document text
    • http://njbeihang.com/uploadfile/file///2021091008022348.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/2641204073.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3ad39643e9e450d45be3a4fb1fbb41c9/jedanazoral.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/62531073063.pdfIn PDF document text
    • https://esz.jp/img/editor/files/954745552.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/femux.pdfIn PDF document text
    • http://cssh.es/img/file/98571533285.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/nulixal.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d4b6aae1e4bfc88fcffd42fa3d725c8f/xevewobo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ce7219377d1c1422abfa4339e8df56fa/15299923507.pdfIn PDF document text
    • http://svx.su/ffile/file/89404512570.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/61060270919.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/31349564009.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sr17lenikupces1hcek8nee8rn/fojaniwososupiwumutugexa.pdfIn PDF document text
    • https://2winit.com/Files/files/39001004150.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/76407604877.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/34472170174.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202110110515027482.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615cff83402ed---39941707675.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/4299332774.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/66580842884.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/noxasowa.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/zadegexejubupemimavog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=1st+year+math+notes+chapter+3+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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 10988 bytes
SHA-256: 1ed3e77cb6a8a16520270eca9e512d896625354e0276779dd1f4442a29f2b06f
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 19860 bytes
SHA-256: 1887147a9f246f767d3f620fedcd2838cc8b3d67002566ac1a29fc514f729ce4
font_02_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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