Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b89d420457d2064…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 18:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0281bfb2a8d1efc9453354484096358a SHA-1: 6c8dc7b7ea28a770db29b179dc7486285dd55fa3 SHA-256: 6b89d420457d2064724b7aed3e69e5dd508844f4d7c4c8cfcb8ccef5119dd760
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser extensions or updates. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, potentially leading to further exploitation or payload delivery. The presence of numerous unknown URLs, many hosted on compromised CMS platforms, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9h0qif738lbcutba0ghtq16re4/kuroroxudamudukoxavilalog.pdf In PDF document text
    • https://ferdavagnar.is/images/fck/file/wuzagifiwalumakotazedub.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/badulanidul.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219627137018.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/zudakuruzubemefon.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/rijodim.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0d35a21f---nalejimodo.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/62136690712.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/5304198472.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/82238209771.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/54265345226.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614018557923b---91946321245.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pupuzofavosenagozofuter.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/disuzalebojezid.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/rejavi.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/35849801278.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/34230146555.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/284408405.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/dufebezaburuzeda.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/mogaxusekatotodofo.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/bobexuna.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8f96sc6c9e4u8plotgtm3j8qfg/xojepod.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/zenarawewixejuwojewul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+chrome+hard+refreshPDF 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_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 10576 bytes
SHA-256: 701bdc46a616f6c9aaad92156d456869aa73413a1494d43ae6418e484655e189
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 18316 bytes
SHA-256: 3a9e2c7e34819ad6ea53cf6b4056fc6470af59ca818fea7ee02b1f0bfebb127b

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