Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28404b8c0314567…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 01:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9b8727728c02abd44ec80f98e98847a SHA-1: 83593c1a2179f7a4303d2071efa275ff99339948 SHA-256: e28404b8c031456791a052cca84e31798d355ec2d00a7c898fda5173e3d604f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/62bea091912d699b5a1295d292f8432e/30846287843.pdf In PDF document text
    • http://caratow.nl/userfiles/file/wegojozutozoliwalab.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce6808603---98130897135.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd70872db6---tatateguxejakesu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40272567789.pdfIn PDF document text
    • http://szpk.hu/_user/file/jelesiwutaf.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fevipafugenawefew.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/pekevatagebilu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ldmk616ur6tiqdo5duh4ngei6f/12059869491.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c373d9fb18c406c866b469d85982f5bc/nosafuzux.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51b53610ff2f6591b9862ccc4b4cd9c3/85915597554.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f18beb89b15653b20b6e677dd075267b/dopemewunojabu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xajibekeporapejiwaven.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/30543043378.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e9f61bb9e9ffb86c07b67774a4f4a6e8/28768676221.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/gezov.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc3d8e99de---82556651618.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210614_50D5EF042321ECEF.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3e2273e4---futixoson.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f86b2dc8---mojuk.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/6kk5gq6erccggdb03cabi49943/mefeloz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f847081ff4---vimararudoguborekovidejix.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba385dc063---3043177235.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/9230628235.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704cdb98a77---76391259630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=thought+for+the+day+for+corporate+employeesPDF 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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 11048 bytes
SHA-256: 3a7cd439fb8aa71bad0494ea2f511044f68dcaa476fb8bab82287712f511ba42
font_01_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 17472 bytes
SHA-256: 2a8c50e3adff9ec8f1506fc3c43e4cb810daee2e226f7886e5dd83f7640dc27f
font_02_sfnt_off00014281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.