Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85e99f399534281…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 14:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 955555d78d71ec8dc61e29881faf2735 SHA-1: c6c4e752e6abe198c26fb44eb7db6752e0fdecbe SHA-256: a85e99f399534281c68c59dca68b16938f78d398b558ea076566d89f9753fce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of these links and the overall structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4f0caf1bb0b8e57f8c41443993f36c6a/daputemokidoremokitagebap.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2ssk041ksit16uqku1p6bsdfr1/mopodaninutuberakav.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sawuvugonegiwepovomajom.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3c170697---63558986542.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b120f5a5469---wisetisasog.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zixufikadekumopusadobopur.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ms8rja6ca4ou5ns9sgcq8u3ens/xogipetutogisirab.pdfIn PDF document text
    • https://memoservicesrl.it/file/saketinotapibejoxarap.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96257d282---visilomu.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/94600655822.pdfIn PDF document text
    • https://blogsma.com/files/90692553404.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/15794495709.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/jqj6d6ghanfm7tbgb5m5v11gl1/94492140917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=movie+box+pro+android+downloadPDF 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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 10508 bytes
SHA-256: 090b11c30b4467f9d6e59cbe1e03b7b64e8318cabc3fa295e447d920d7f05821
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 17760 bytes
SHA-256: 57b2a394dd8897abc9c3cc5ef8a0ed079cec4f9f95710204abf1bfa4ee927155

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