Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e2f59faf9b577b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 15:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c37ee2630e3edca39029c27ce47d7ef7 SHA-1: 4b0578aac68bc99bfe96cfca611593421b65591d SHA-256: 88e2f59faf9b577b2475a8959ff84154b619a68144de240e0f79eaef2042dc24
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. Notably, it employs a social-engineering lure to prompt the user to install a browser extension or update, a common tactic for credential theft or malware delivery. No scripts were extracted, but the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://drafthe.ru/uplcv?utm_term=crash+bandicoot+ps4+free+download PDF link annotation
    • http://www.cbs-emballages.com/upload/file/76748742922.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/40620255786.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/17037782405.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/wepebufiregu.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/74625123854.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/eoa3tu1b4u2eimfaav6ia77996/kebukajisawo.pdfIn macro / runtime command snippet
    • https://marugame.hk/editor_upload/file/60813433805.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ab90be0638719025ce845130a3530b65/zilixetoge.pdfIn PDF document text
    • https://grnca.org/img/files/files/xofewifozenovibota.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dogerizaxuxokejobo.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/kegulebaxipu.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/67799230493.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/falimotarajafuvugan.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/jopumubev.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/risejadufedodobere.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b290d26a1e---xijiledivubiv.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/60013665287.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210914095603.pdfIn PDF document text
    • http://proxima-design.cz/files/file/gipifoxamugepudil.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vomol.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/guzage.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/dedozepilosexefoxoxenenu.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/luwakugiwi.pdfIn PDF document text
    • http://tcsm62.org/uploIn macro / runtime command snippet
    • 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_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 11052 bytes
SHA-256: cbc51b2ff861b1de4fbb805a82f9515f523bf1787b782dac7ea4c5a79e799aab
font_02_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 18784 bytes
SHA-256: e10a704793eaaccf2fb9ebbcb3a0ec31d0d5e08a45bb4b9a3e3da3d0640ddee0

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