Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b28df8522e9e21…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 00:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1007b64f8d62b191980332e934807f6e SHA-1: 97df2e0c6d489c341ecfe23e02d1dc1a91fc7bc1 SHA-256: b3b28df8522e9e21152da5d75113d7b17a0b1aab9615ed5618dffb31f8905965
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable hosting. These URLs likely serve as landing pages for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://pistant.ru/uplcv?utm_term=fifty+shades+trilogy+movies+streaming PDF link annotation
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614317622c414---35058015482.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fvoknea3b8tvk3a1khhekgq56m/xanuvedak.pdfIn PDF document text
    • http://aimic.com/userfiles/file/runixazusugevamuviwabus.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/nasosidigawuvapuzexujeg.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tafeginal.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/12728690219.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d3c76344ee538c422ff421388a1a793d/boxenesizozamopogiveku.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/busudexa.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/49445266917.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/22437241056.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/57528595433.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/jajum.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210902_7DA73AE098425BEF.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/27798520897.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf71dce9a---88691958634.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ac7b98755b3f4053b1bee79ea82854f4/95368474615.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/loxikozevovajijewafujeze.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/89621210990.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/89908795759.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/52924971836.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb60c559d---18283387074.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/24353993336.pdfIn PDF document text
    • 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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 18192 bytes
SHA-256: 652c12de634a29968bcd8f15834c81c0d892a66eb355e80eef0d35dd65f7cef2
font_01_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 10956 bytes
SHA-256: d1eec053c1ddaa17108aec04eabbb1f22c6b1357fcbe5b135e162ff1bf086c83

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