Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8ac8325614bf42…

MALICIOUS

PDF

104.0 KB Created: 2021-08-06 00:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 648367e088d6b618858af8ab4b550b6a SHA-1: d212dc752ad98b6afdd6b3aeaf232dd09de2c698 SHA-256: ea8ac8325614bf42437df7624bac1bde85a0527ecdde7b2d5c68c819e0f85566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to download further malicious content or to phish user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a89263067---28726045270.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460cd4d015---lupugumam.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/08lg6t8s5ors7cig1rp5dh4u4m/5647925750.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/70178707928.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/76fe902a8c2dc86d26f095b1f5d82333/57723573641.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/aa42125fa7a89386679474bb3fdf0c27/79481513999.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dfn06g8roiamc3oms381ngfqsv/6129105798.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210805035349.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/2383713893.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e01ctj4pdle464lnasquaku3q6/gavediw.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/xanilexikirubogo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad8ccd879---tufojegojaxifaxodoki.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j8rd3nbhs6ru486slmk50la83d/70768634181.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/leguxed.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/bibisojubewepemoteponuj.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/99124637283.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/3119735516.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/54328352491.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160834961a1443---24291018250.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/xowimenu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb852f819---35526634549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+solvents+is+benzoic+acid+soluble+inPDF 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_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D9 10728 bytes
SHA-256: 7b7bd347667d63538fe81f17fca3ec89d8ef5b46035ae32cdb01a1d54854a68c
font_02_sfnt_off00015e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E82 20204 bytes
SHA-256: 2198591d553cf421b23b970e918cd8789de9fce5ce70505379b7e0aa9f2ce2d8

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