Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccd919eb95129ea…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 16:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e047021ca0787e45841e9a1b92a4997d SHA-1: 3898a8797e2f7b0648fd37fd8c3b12875eb67c06 SHA-256: 4ccd919eb95129eae494254623fb0384c30b68cc251c5f081f54ee5a351336bd
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://fzclicks.com/demo/files/editor/file/58741766954.pdf In PDF document text
    • https://activepymes.com/pub/file/fusujikejarerugoxunovarat.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/72110532895.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07cbe723c---76631045102.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/77910339927.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/jegaxuboxazalu.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/99511440630.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16095f9060fc2f---rabotatis.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b01a0acc8bf---15279139404.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38d951ef7d---24689288223.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3256309e---deputitumamajinunalipi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0a13da52da8e90bc9c60e6e5d94dc5dc/giduvereretituforikozolog.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/10228066689.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/83499415748.pdfIn PDF document text
    • http://mousike.it/img_ins/files/donutabozobogoxaw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948074de3ec---kupos.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/918dbe187faf1acaf822836eb52785a0/velonofodipetofipava.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/48072427307.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/motaxunodevoz.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090367616f56---sekugeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=libreoffice+convert+word+to+pdf+command+linePDF 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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 18488 bytes
SHA-256: 91856424b68aa1f19ace3e26257505186aedbb2db7be432fef215d9906868ebc
font_01_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D4 10860 bytes
SHA-256: 2e9b8ce4421bef7f5a676c5e3f5d73dcc655cf72fef91df8e4c3ae00006868b0

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