Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eb102e7498d81e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 01:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b15f65377e6c492fed639543a3f783f SHA-1: dcd1ffc2070d930a8ea8e2c7e9e30f1ba872cf4d SHA-256: 28eb102e7498d81e77a60163d59d5122a278d92bb3f06c9bb464dccaf0c790f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d3fb2fb0---71578003171.pdf In PDF document text
    • https://discovercefalu.it/_data/images/file/rulogudifipijuvuvomeroda.pdfIn PDF document text
    • http://ktcz.eu/files/files/68331591086.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/9320128076.pdfIn PDF document text
    • http://xtra360.net/campannas/file/68613631735.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210606143819_3522h1.pdfIn PDF document text
    • http://onelove.cz/file/miref.pdfIn PDF document text
    • http://jcpingie.be/public/files/90100926304.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e25d14cd---68346031179.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/jarusi.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/54590183033.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/zolewesobapex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabc445c9c---62107601017.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/mixugofumilobetumi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04a9bd6885---24227693158.pdfIn PDF document text
    • http://belloverde.net/emailer/file/jumewinadiwukuvezovukuweb.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/uhop3hsvd3hq67n0uvmv1q8lbf/dukunejizifivev.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021080512462973499.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/67483098927.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/21628767155.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/55352906398.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/kuvegerapow.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bunaxugizapegamofuw.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4cef77f68a9ef1d05140009c16f587d3/1583109760.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/85031652517.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///16426525269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=besiktningsprotokoll+l%C3%A4genhet+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16208 bytes
SHA-256: 985d77897fa4ac72e22eb40092350881c22d33eb2af824db24228573733b1c75
font_01_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 17712 bytes
SHA-256: d7c38719f4b3f0742727d0268fdeb09025a8988454458777d5cd7f695910a448
font_03_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 11016 bytes
SHA-256: e436adf56ca3e9f475ab08f25f36a0db657481423c457aaab1af6646592fbe1e

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