Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8884945f2f61873…

MALICIOUS

PDF

69.7 KB Created: 2021-05-11 19:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b685d85c40d2eb30ac0b0691ee4e5e SHA-1: af02978ddb917a83e45656b5225760ecc145e117 SHA-256: e8884945f2f61873717778c7fa7fb700d8cd2ef30e0fd0628f73aa5a6638340d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://augsburger-dartliga.de/uploads/file/kazivedilupekelekabi.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f563f54de4ead99704f279caffe7212b/zadezuvafixogubogujo.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k6arpk7lebbphbv9itslecnbf5/sozofumaxolevawemig.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ggsdkua0au55jkdfcu663666v7/gejozujopifif.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9b758b65068770d0128c936d51289bc1/17852629012.pdf
    • http://zabradli-znerezu.cz/userfiles/file/98073718235.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099820185668---99027205421.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160790477befe5---39770219262.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3d86d691---87939557922.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/a5934173c817e707e9a025c4e97981a5/sojadaximipitejusipomasug.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094842b41610---73789170091.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6fcc5ac4e---57695736884.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8a91335f---takir.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6aee7d453da5da10ff52628e62e6a6da/52468472351.pdf
    • https://airbays.com/userfiles/file/86386597246.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qn2uijjie114lfddh4e8h3t86i/70556038995.pdf
    • http://agcslohian.com/userfiles/file/62654091827.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fortnite+battle+royale+ipad
    • 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_off0000d107.bin
7f7a7d1f6744720c88afe7b4c5e3f0c3d979f60e9996fa1223a72e03ac7797a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 4972 bytes
font_01_sfnt_off0000e204.bin
96b3cdea0520f95d148c9ae6afa4fbea95c8404d89d156817c86cc9e07600635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 11892 bytes

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