Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1e8933edbbeeb7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 14:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aad3757c4a9f9866ddb0d3e774e3280c SHA-1: 707528f55b0a30ae027e739caddf4fa84aed950d SHA-256: ba1e8933edbbeeb7a7a0d3307750225c247944f5da49c6ed2e30e74c4dca779d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other potentially malicious files or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination or host the content on disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://piti.leaddeehub.com/userfiles/files/55571821288.pdf In PDF document text
    • http://shyjjc.com/v15/Upload/file/202193122187160.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/43323382567.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/34348007048.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/xebaropetonez.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/7514003939.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/joraneliganugikigavato.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0acfe6f9e3cb67da97deff64eb76f71f/japupidulem.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b3ad9bb743fb6b651ca602da116bee3c/terizifavuwipebazadope.pdfIn PDF document text
    • http://mayjack.com/upload/files/82299316952.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wufuzasavabejefugozu.pdfIn PDF document text
    • https://blv.by/upload/editor/files/91540235728.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161406b7f1e48a---28445479698.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/93552672377.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/kivenebolegolizonatuma.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f54163ee4---81592630220.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/97686094109.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/1829661382.pdfIn PDF document text
    • https://dom-titan.rs/files/taxibi.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/bonusate.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/52633079659.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/nejusab.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/zubodupulefa.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/22320170988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+good+witch+season+6+online+freePDF 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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 16852 bytes
SHA-256: 37497c13332098de255c393d99882fd8d433935e0abdd8bac2e48d0a60ecd9f1
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 11000 bytes
SHA-256: 9bb7361e42a887d998a17a5bb3ef748d0975c6ba58a88836feb24164c05e8f2e

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