Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fae219fa4f5189e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 10:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c8fa0b3c6a05e22bb0206808efcc5d5 SHA-1: f662096106f2652cb2273f6a2dd869f85c8207f7 SHA-256: 4fae219fa4f5189efbf5edeb080df829194498ba3db8ef316142d826a41a6a3f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as a phishing trojan by ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting domains. These URLs are likely used to host malicious content or redirect users to phishing pages, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nomylo.ru/uplcv?utm_term=vivir+sin+mascaras+pdf PDF link annotation
    • https://ldoris.com/upfile/files/20210908001821.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f1f20ea3---69149214253.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/9140361365.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/87307861114.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3df7cd646c3141e1fb02b334de978d71/66127421109.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109121104425443.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/zoviwebipajag.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96803107170.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/21049302545.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109112311254857.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/govupodu.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/19734056084.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161424885e0b1d---36709977242.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/17336068176.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320300611e5---7076691641.pdfIn PDF document text
    • https://kratky.eu/files/file/64891480800.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/segorilulemizidudovurewe.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe65bc5fee---48220016617.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/53376654598.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614233e3a9181---dawotowarina.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/38279022970.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/wolewalidufegudowimow.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210913_EABFDBD13B217BAC.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/detisumiz.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/fonatuxokobebavumit.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 18596 bytes
SHA-256: 5328721f43ec784a75e5699d14109ef4b37bbabf0fdd54777cbc90cb0dd468c1

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