Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc3a84f1a64384e…

MALICIOUS

PDF

75.2 KB Created: 2021-06-19 21:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6686a0c3f0b7f9793d2e91e7592ac1fa SHA-1: 25b1cfe56e56fddd0f08de99200ba8eb40c419c5 SHA-256: abc3a84f1a64384eadb99282c55522937dc2a138d4ab61c89c60b9a1075a5bb4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware. The document also includes a heuristic indicating a user-facing 'download button' lure and an explicit instruction to disable security software, which is a strong indicator of malicious intent. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://hrmconsulting.biz/upload/files/fugajafegagufap.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a28113f167---zisinaj.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50fe83376c---sigobixorimazuxutuxiti.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/24619840090.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0bmb6erucmd0aqg15vvd5egnk2/fukegetedibirit.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a1bkc4q96udt235uotfsnhs0t0/susunaxafuvilaxaligojiwez.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/he4ht7l861egl6gj3gc4kp0tdc/mavamez.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8573f237a4---77682674148.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ea6b03ac---salopisoniwolokovolimoniz.pdf
    • http://allprintusa.com/admin/images/file/sipafolovajijabunuto.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef23342dc---litafef.pdf
    • http://airconbank.com/upload/fckeditor/file/68791892529.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ba7693af39227769addde090a85487d7/kegavelawoledogafojari.pdf
    • https://circolodelpistone.ch/userfiles/file/13747789213.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609139432fd3c---17056553137.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c359fc67---rudevulilozazilu.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c3d2fb9a---56083826023.pdf
    • http://www.sunargrup
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+zoo+tycoon
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7de.bin
d3ecad92902e685fc0d0d6d5f92a6e61e6a6785eea57211543bcc9ef75356207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 4480 bytes
font_01_sfnt_off0000f740.bin
e67ac026ea08d158ba21d9f0f000bbfd346dbe5cc53b91fdf259e81557dc5a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 12984 bytes

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