Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49166a1e5ba7217…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 11:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ced94dc1165ccaf4c334d61fd2ed7d6 SHA-1: ee400dc25714557df16ab7f8fcebf3e513837cc8 SHA-256: d49166a1e5ba7217fe9d396faddee4885c4e2223a258c98e0450558258663570
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm with numerous URLs hosted on disposable domains, suggesting an attempt to obscure the final destination and evade detection. The presence of a 'download button' heuristic further supports the idea that the PDF is designed to lure users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yokohama-model.com/userfiles/files/rowobekukaxalafimiga.pdf In PDF document text
    • https://raselapp.com/userfiles/file/64250925131.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/85230961227.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/girutokonuxet.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/38668619102.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/lofepiledonozaxe.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/lopikemenulumi.pdfIn PDF document text
    • https://limsurdua.com/contents/files/nakojez.pdfIn PDF document text
    • http://pinxedien.net/upload/files/81576728864.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372359ad351---luzofukojobulamozeji.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/32755026303.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/28802641984.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79930296271.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/fagaminajipuniri.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/27526002745.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/wopovadotofatigadaneb.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/nutabuvipidenuxakoba.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/mivatupozixarasor.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/31862299178.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/10649234717.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/939e9270d46127633a72df005851e8d1/sizujozugolekodit.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba24553b---tavadapariteliwe.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/zebofotunekasozipelodem.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/wolamonasuweguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gloud+games+pcPDF 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_off0000b3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 16304 bytes
SHA-256: 8920be4b35b940a3ef97c855a48d931ce13a6c9bc9201a421054c19e08406b66
font_01_sfnt_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 10604 bytes
SHA-256: b551e296c98edc7c7926c82e89f3fa024ceec706fdeaf41b92d37e21bf501d6f

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