Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59103d302ed6cdc…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 23:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4dcffaa04eca1ad63a5d00d1f81a7534 SHA-1: 8479f63f7027d177407dd48bd368d78598d6693f SHA-256: d59103d302ed6cdc079bb5631d8f8d0ccad2621beca0ae648f17dc2ca37036be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary intent appears to be SEO poisoning or directing users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://kagoshimakojintaxi.com/userfiles/file/zupexenunikozopux.pdf In PDF document text
    • http://bmsorganica.com/userfiles/file/jemulanuloxizerexeridefim.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/nejumigiwujig.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/338b0be5a14712aaa36a652930cfba2c/53728788038.pdfIn PDF document text
    • https://norservis.com/files/files/5520680818.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/tovidijoru.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4597126f---kapukexuvekosarij.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/4858832472.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d4ckm5acjdg9ntjf6p8hgvjkj2/sixosison.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/dudofapinuzot.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210705_47067E715D16FC97.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d5e5cae4f---14713060125.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/db95702b0e0f25db84a273701f438803/69816407579.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea94a48d02---ramudaputo.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/39005135584.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b977bbe9997bd1882aead4365c7d35a9/bokuvaxoxidabud.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021072922075958.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/23790462565.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/zabubijurajivegozafa.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39df647c1---88958529144.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f0bcb111489c9c841f9672b5584982c3/fokajivaligex.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/lidafemogawaxamudapeloba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=moulding+sand+testing+methods+pdfPDF 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_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16404 bytes
SHA-256: 266db9e95ebedee4c039673bf4ad8f8f9415fbb6e7793a8e682c8f98c71398f1
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 10940 bytes
SHA-256: ccd19541f3b3b4f5c0a59ded24943db4a60c3c14b9e9b94a9d9c1a63075f1323

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