Malicious PDF — malware analysis report

Static analysis result for SHA-256 987a47a4c22c2640…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 17:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84ec8c211829ec85cc2c5f103489e700 SHA-1: 7c5102e0dd388a0f77b22793541d1932a2645ec9 SHA-256: 987a47a4c22c2640cdab1b37298efda9ee451fde9f2223444d1ef5eaee62c2df
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://classtool.info/upload/files/58242552910.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dhsv55c860ov6rvpmrje9jo1n4/92604327833.pdfIn PDF document text
    • https://maisonforville.be/documents/file/18876704174.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9a222900f5850ae7e6b4d1006f564acf/peboxadekebejenafapagov.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126db793ecb7---49804839415.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/tofulofigetenalovixu.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/tudodegarozalavoro.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811d8915f00---bawamipum.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/28173695217.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/eb393c09bcd7a411c3990f164d6e8a47/gepefaxotumow.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zaritiridovoloxis.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a55d2738b---demisobuja.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/74607249757.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/xobiwe.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/luwafafinuwoxe.pdfIn PDF document text
    • http://domuran.pl/files/file/kitunaxof.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/25374017944.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/58680670891.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/aebd8c75a4b7b5b13ad79deffde2447d/73608173706.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b29753eacf11e0ad56bcbccafa6d4ff9/vejirarif.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc91e3449---68697198822.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/a3grs3ginv3u56ltns5aftecv7/petulovupadol.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8d2d56d72---31948126452.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/jesanafoluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lspdfr+traffic+policer+radar+gunPDF 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_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 10852 bytes
SHA-256: c3f8df57a36c6832a2cb865d43224257b29d1185c48c460bb585ca8ff8aa7ab2
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 18696 bytes
SHA-256: a8c438b88d2e6fc8225b9a5837772a05096405e4b989ce24763fdc781fb3d344

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