Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac13413977780853…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 06:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84b9492ab991aeddf96bdf62a52b5700 SHA-1: 9724134a648df210e3b02ff64b607e61f892cf12 SHA-256: ac134139777808537c0512822d27b80500ec857708453976e871d8f910a11644
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hizirferforje.com/admin/fckeditor/editor/images/file/gowufipulovozegunuxu.pdf In PDF document text
    • http://kanalizace-ul.cz/userfiles/file/tulum.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/wizabalalugeluzizozew.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/kojutirudeserowu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/39413856474.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e40fa543d6---50140508372.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/fuxosopumonagojewofapev.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/wogusibadurekodotonubin.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/1166412196.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1b1c3eff2a7727a3f970e3894728cdb6/81400336319.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/nawupininezam.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sgmb6f6lvehhlruk2r02bl3un7/30927013689.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/48812266506.pdfIn PDF document text
    • https://pmms-online.com/assets/file/40968834989.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zanovapuvapawejopifufesi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a2aeceabcaede44aaca1e6e463d360ba/kubukokisulepe.pdfIn PDF document text
    • https://pindimana.in/uploads/file/49700044595.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/83654181620.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/26715544305.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/xoregenolafa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8fcd5e3eccd78e9ea7cba3f2dabad81d/jadawezoxika.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/34843135604.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/19/83099597632.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613791faa6298---wuxirewuxuvinuwu.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/28846244026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=present+perfect+past+simple+exercises+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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 10764 bytes
SHA-256: 78956f9cd89d7bd8d5c43b601a947c458aa44b868cac8198e79ea0c15c91268b
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 16292 bytes
SHA-256: 0f49c5ada08f896f9f2ee88dbab1c93027883d5099476b5314169077cd6a8c48

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