Malicious PDF — malware analysis report

Static analysis result for SHA-256 5769842a6a167b20…

MALICIOUS

PDF

95.6 KB Created: 2021-09-01 22:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4249a9a6650632d0157af12fe52c78c0 SHA-1: d215da7257d6a19549e952e93bb4de492b34f90f SHA-256: 5769842a6a167b208a89798eec4f773ebc63f0446e1fee4771e8218587145ddd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://southtours.com/wp-content/plugins/super-forms/uploads/php/files/edmgrh48pmdmjcddnlc2p7afna/84368967688.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddc05ed9a---77495910594.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607981bdd223c---22670617820.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16114a6f65c38b---gokutexupewogidejaner.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6df61995e700f58ebd861a38dc10dffb/vunumanikujosobexelewo.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/58546627535.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/33282794473.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/12374577665.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/43b83d8c88ce964c6412ac5e49320a3d/49108707456.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/lopusumo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/70d309e0bfb0cb24571840e5d2342366/47129349302.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/14d2405135aa3e88b03a39b7ea19a8f9/91712536775.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/84870323040.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/dt6dph1eanakktjihvmlpofj62/feluwivewuj.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/6238663899.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f30023e0---26689460034.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/3978279853.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6fa0f26e---20232423985.pdfIn PDF document text
    • https://tcremich.lu/files/files/jarenijasomaze.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/kj6voffbnppqtefijumfk4g53i/37176055325.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/ririrutasunuwotuw.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090501164ea7---13803802738.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/lekozona.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/fifezalaxe.pdfIn PDF document text
    • http://teraval.cz/res/file/xofonivujomebenezafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+does+glizzy+meanPDF 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_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001295c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 18136 bytes
SHA-256: a6eea6ab20f52c72e615bdab0eae3b8fa2022550842b6c49948a716ffd250c37
font_02_sfnt_off00015798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15798 10760 bytes
SHA-256: 87b75659b9c90d9090454af7760489729aa559b5833510aff2c004178f3dc99e