Malicious PDF — malware analysis report

Static analysis result for SHA-256 872e5da2eb8432c6…

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 13:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa490cc691e1854f85a8c9678bddae5 SHA-1: 6c5e42f5a8b863c940ad40fe7cbfc323eb5123ea SHA-256: 872e5da2eb8432c6cb98135e001de581f8218b543233dbe5bbc5229124215514
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://austria-ex.com/images/blog//file/44341320317.pdf
    • https://alternativecarrepair.com/userfiles/file/85428649557.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7d406148d3da680b7d1ef3a468a99e10/visojobelenolejimebexesob.pdf
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/dowekikekoguxizusekep.pdf
    • https://healthmatters.me/userfiles/file/48551331955.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c258c6983f478f9d125c0bc1b232dac4/vufeso.pdf
    • http://leakefamilyreunion.com/clients/63964/File/61070279321.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/13c86ded028810745838f179ca5e6634/xafejubivotokal.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/11583465525.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75655856001.pdf
    • http://buergerforum-tirol.at/file/52092899743.pdf
    • http://martonaroniskola.net/userfiles/file/sojikapiwozijokivanomu.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2823848c---guludi.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acd50b322---45268893099.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kakonu.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f8bad4b98---2596316690.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da465bd6a---wedinudibonibu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e67e9560---66216339882.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0aa13c9d5---43098234796.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f5714b45960439a013653dc07bc356c5/7112960222.pdf
    • https://balajitutorial.com/admin/userfiles/file/gevavibedajuvidibiwijije.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e37ccda78e7d237f3cd69216a2f7df4d/xikez.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc4d3a0c0---2444845277.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lessons+learned+from+teaching
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa6.bin
971a1740bd3881322616694919331da20b6f900e954316472f3186a6a9c919b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 10880 bytes
font_01_sfnt_off00011364.bin
706c4a85e5970ad473cbe9f6ed16e9b0a2f91bdde033e36784333aebf9539141
pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 17284 bytes
font_02_sfnt_off0001405b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1405B 16792 bytes