Malicious PDF — malware analysis report

Static analysis result for SHA-256 762f8adde5f5b005…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 15:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab7b7ccf8fd06d99fd6ec777e046c14c SHA-1: 3958f9a63f50d2cae3ef35effdd67c93e13e4323 SHA-256: 762f8adde5f5b005bd4280198c8486b82d53d5a89879d43bfa3f69998e7fe251
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised WordPress uploads and other disposable hosting sites, often disguised as download links for movies or other content. Embedded JavaScript is present, likely used to facilitate the redirection or exploit vulnerabilities, contributing to the phishing and malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://uitvaartverzorgingsindex.nl/images/uploads/57493773018.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613a44eae533d---16396895694.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/88667091029.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/85260700308.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/latetu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/37273377629.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xexivejatomavus.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109172050154024.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/kebegomotatuseme.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/76570549420.pdfIn PDF document text
    • https://endobible.com/userfiles/file/17497122775.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210901211321.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4399feddf554b3e98014bac8f0fad11/setadasufujexok.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/jopimafexururijepux.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145742254563---vuvanodukenebumafotaw.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161364111e06b3---jifaruvelogexiwexoz.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/67641271616.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/60720070402.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/85991624297.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/95053438540.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/9651318903.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/tixapalenekedima.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/96056972023.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/90398471972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=radhe+full+movie+putlockerPDF 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_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 18236 bytes
SHA-256: f95da3c704a8f1bad34eb656b232c8fd52022089a9cddadd39b85607efd56990
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10916 bytes
SHA-256: 7bc9f0656ba9a5840714a25c91538f507e95885a475d5a16f400a9cf749fa0d3
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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