Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9e912fae653fe4…

MALICIOUS

PDF

85.6 KB Created: 2021-08-10 14:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11c7abb3848dbebe434022e2a845e711 SHA-1: fc55ab9f80055b4b569976f28f6c6b4a9a536af1 SHA-256: 5f9e912fae653fe4b4ebcf35a7c8d8775064830c98caccc98ceed58eeb64ebb7
144 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious characteristics, including a high ML classifier score and a lure to copy/paste content into a command-line context, suggesting an attempt to execute arbitrary commands. The document also contains numerous links to external sites, many hosted on compromised CMS platforms, which likely serve as download locations for secondary payloads. The presence of a 'clipboard command execution lure' is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=windows+xp+arabic+language+pack+download+sp3 PDF link annotation
    • http://angelescare.com/userfiles/file/mapobobamavativalukajevi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/nubavov.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/patosuvez.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ee1999617db029e4b863e2d63b9adfaf/85755949874.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/pekejamamux.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/19401074358.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/21494061325.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/600d351e9f5698f3f41da908a659bf61/283758839.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vf9jmba5oamiiagk9g96s9epcm/2496915920.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/rejeruxawagunawaz.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/rogomodomozut.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/5952779700.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/maweledabimejutoxuxo.pdfIn PDF document text
    • http://seamacros.com/upload/file/xajawejamurawegipike.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8043ce43b829f047e2a2059e88145dd7/toxubazumogalija.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/90ebaa4951bc9bf423da4756841ba07e/zumazifop.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/kogiviwuvutolamas.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/taworovofal.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16940 bytes
SHA-256: e5a538a1a027101eb27d78fee42857622664b532b836e3ecf5ff30154a0e66a5
font_01_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 11276 bytes
SHA-256: 59492e86ab5175eec4cfde3b3e01012f6566d706d31b6ff61d5895810a95cb0e
font_02_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1