Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e552ff57e9ae32…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 21:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 739fcde2a4187c3fd80a56d288ba967d SHA-1: 95c0c25bddcd9b4f85504a7b23faa055fc302928 SHA-256: d8e552ff57e9ae32cb73b44fb370c8b68f0fe0c6683febcd3b26244cb5ca138d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/78130300818.pdf In PDF document text
    • https://strategieb2b.com/userfiles/file/jivopipezitopejuwisesur.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/zedufokasajoxogejewo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611746b040add---17776270622.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/32022714934.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/setitugonolaradixi.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/32554463120.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/gonepodawavinufa.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/najuniritejisevufigidow.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/30724360896.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0c2742a9---xejukewokolitisoxolema.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/roxiwikefedufubul.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7r4ghqc61inj38ghd2j75jhoq5/fogopugoxanipe.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/43268610900.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7692adda7---kizizexijema.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722af7acc8b---sizuboxaxob.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/83811625661.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/51482203971.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/penojapotobidexi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ahh2adj1m9vqg4k45mppn9i300/pumasipakelekakabufiso.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5610c68d970dd15e57440c7a4c2e0d4c/zinagexizipoxolubebafaz.pdfIn PDF document text
    • http://ned.ru/uploads/files/4922349732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=preventive+medicine+7th+edition+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_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 17400 bytes
SHA-256: d3a000b9e45a467ba6221e1fe7011515df5f9bba068356fc6210e65e87c4e676
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10624 bytes
SHA-256: 3ffbd61f0a186e77386e6f3dca71d42bbcf4f8a879043f7c9079c1ee11bfa660

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