Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c36e814fd638b14…

MALICIOUS

PDF

111.8 KB Created: 2021-06-29 09:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e6b4fd85fe510a1a4ca954d04092700 SHA-1: dd7963bfe9e98f41a8e1f53fd166219a45f41644 SHA-256: 9c36e814fd638b146ca4136abfaf0614b995e832f2c74f5333e263b0499f5159
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains multiple links to external sites, some hosted on compromised CMS platforms, suggesting it is part of a phishing or malware distribution campaign. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, likely to download and execute a secondary payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document also provides instructions for handling password-protected archives, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=unable+to+locate+mintupgrade PDF link annotation
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/23effb36e932c94ecccc76481878718f/puxakimikobet.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/jaratelaluz.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/wewowedesavigisavipez.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/58rf7j0le6et7vips89d52dmnv/vajexixi.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2b9983363f02ad7a9b7a44fe3db32631/99415900646.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9c815de---9171775651.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/57807367885.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccbdee661---botur.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/lugubimazofiz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6962192c---nasalukigumedoxok.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/buxaselusiximelovenu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1fg7qv9096njpkek68psq6chuo/kobukoboz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a414f4ceefc---vofavuvapefuvezepuloge.pdfIn PDF document text
    • http://cl-pub.com/files/files/bepiduxemuvotow.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bc71548952ce8a26872294b08ad756d6/82196217908.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/liwofokuzeruzitin.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/7281633944.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb1c5d37f---sawazuxazumisupe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca0284a12---besen.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c16de478---51324838069.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vupaximox.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15240 10936 bytes
SHA-256: b274363e0c1990f28787006fec998ffb0d95a95407a248c41fea29f89394702f
font_01_sfnt_off00016b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B18 17792 bytes
SHA-256: a064338915980fa588340d56b05342d7fe068fa39ad2cd1a2a5ba39b5766b7b4
font_02_sfnt_off00019a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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