Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f24a2c9e975b14…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 23:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 196281f7a5e0648789b6603a7c4adde4 SHA-1: 4c2aa0088ac664340b4329aeeeddeee22c66ed97 SHA-256: e5f24a2c9e975b146faa60058848f62e4a332292d55dfd4c00a5d796df6ab6f1
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to external files, some of which are hosted on potentially compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true malicious destination. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138283705d89---wuniwi.pdf In PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/88040671513.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/wizumezop.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/46516796918.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd1fafce0---11093884071.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/18234843991.pdfIn PDF document text
    • http://mp-journal.com/media/file/63459575311.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/linemexitamuxube.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/38051980163.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/netafamage.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391adcdc662---rimun.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/30096990456.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/pigogujemaw.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/48391371828.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec11cbc73---nodivamexutesisas.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/76690350853.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/30227580942.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/zedufasozavesamewafix.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/35841718091.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/37437297322.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/20977223650.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/53428754470.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/15624013482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=share+files+between+androidPDF 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_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 17312 bytes
SHA-256: 2b24adf6cd1cce8cfe16e54ee51770e736a67d93071b8592b8f87662b4e22fae
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 10752 bytes
SHA-256: 4619735b57aeffecb5ea823122cc19d266963c7cb9553da6d0dbd78539b31a6c

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