Malicious PDF — malware analysis report

Static analysis result for SHA-256 25179f53354c675c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 06:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae59269692fdc143a1b84e2b0a51e6a0 SHA-1: 426d36c2aece7e4a33607c25c11deb7dafb2c541 SHA-256: 25179f53354c675cada1e6e2668c8c95753fc867efaf5abf215f3499d42c9e5f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and numerous URLs pointing to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or phishing for information. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laconchigliacasevacanze.it/userfiles/files/ragezofepoxevapa.pdf In PDF document text
    • http://coeb.eu/userfiles/files/55335309234.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/nojeligodopewovotinawuxu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/31763567872.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69cf5c7ab---44297155313.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/totun.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133266bc4135---jinav.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/gonobujofudedodamo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b62bf4e5---35058966205.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/jogamosusele.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pujarenud.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lubalebediki.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nosateroxakarofu.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/fetobutojiripomelotikov.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/duvedexi.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/pijamedizo.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/xuverepiwixowawe.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/49414730019.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/26588450388.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57597295189.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/jarobuwifipasuzobiralo.pdfIn PDF document text
    • http://generaldistco.com/images/file/tejabiderawupamexiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=official+guide+to+gre+general+test+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://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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 19380 bytes
SHA-256: eafc3784899b1181f14cba42f5db449c8e1be7a823b746a917fdf10f966d9cea
font_01_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 10920 bytes
SHA-256: 497975173173e5a67e4fab3d57725e3a2a20a34e710cab061c73a740943b4882

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