Malicious PDF — malware analysis report

Static analysis result for SHA-256 358aad653a0ffb50…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 01:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 069f84800294a2b124a525c45ccc7802 SHA-1: e9c1c3a30aa25901805d5a3715af212302c1ea25 SHA-256: 358aad653a0ffb50be957efcf5cd74ff101d2243d6660d64f180da294fcc2de1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. These factors suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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
  • 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://coretry.ru/uplcv?utm_term=gboard+dictionary+download PDF link annotation
    • http://airmon.hu/images/files/sixevopigadivaxis.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/12366550725.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a19c8b758---rubinekuze.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/25404558540.pdfIn PDF document text
    • http://telecycling.info/files/file/fovubabixumekudusigejur.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/lepunodiruxer.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210913110109.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dofixow.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/95323344082.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dc3ab408d---52356577919.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/74588953199.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/jurolisilaxawoxezidaseti.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210907081638.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/gojipubijufekureluxefo.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/purekorojupufozij.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ce8390eb0fc2de8d82832db9d4883b2f/63979992998.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/49517258967.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nanavurenuropekit.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/5573179271.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/maloxopafux.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/49949426ce2c842603df6275f7fa52ac/81957349590.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/fuzexezex.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_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 10440 bytes
SHA-256: 385d908aeff4d6f1ab9928f9811e4b84e3a1467c9054a1c3d3d493055b8536c2
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 18540 bytes
SHA-256: 5bd2101dd730ce8b523b00c28d374f7452755a96ebccd2da5cc9510088b0e3c9

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