Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd2a403c89831f9…

MALICIOUS

PDF

75.8 KB Created: 2021-09-26 00:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd9093d0e81982cccf3b6bc1127b502a SHA-1: 5662ae88565fb7efe6a5c6c306ca95f095e3241c SHA-256: 7fd2a403c89831f95e385ecd1b047a3d30763ce2a69d8b43adca38395390aff4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The heuristic firings suggest it leverages compromised CMS uploads and disposable hosting, aiming to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=driver+loft+for+beginners PDF link annotation
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/39640565603.pdfIn PDF document text
    • http://benetalent.com/upload/files/72200143778.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/06967b2f7108616cab1003f8149ffc79/38345424319.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/dusemuboposas.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/11713646522.pdfIn PDF document text
    • http://boki.hu/editor_up/15397289444.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/motew.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/bajajoponeligifuwaxezod.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/rowizapedimulovi.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/89440660134.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u6h52j2ngf0gs764emnh425duq/18544096328.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xabatedilofulo.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/13191019338.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/lunevefuwomusefafu.pdfIn PDF document text
    • https://manenshop.com/upload/files/pagisike.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9ff54c37d3072cfb7bb6f84243df3581/21779327491.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/xotitoxek.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba0f2565---59370692038.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219619393543.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/depoxasinijitu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/91041803880.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/juxujaliba.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/8062375284.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_off0000c348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 10432 bytes
SHA-256: 40d6a9e45bccb4468b6eaf6022acb03329e62354b77368edfdf4725b216ad523
font_01_sfnt_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 17952 bytes
SHA-256: f136f4e08941f113987a76f5fe45a583a45bb2701cbc0fa299c386b75c208842

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