Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e108f86964209c9…

MALICIOUS

PDF

107.5 KB Created: 2021-06-26 02:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 047479c8554f2facf8460a9cbbdee64c SHA-1: 85923335fd1a9f1c28595cfd5f57a753b646add5 SHA-256: 8e108f86964209c97bdd6725195a7e12e2ca7b272034fbce3190a366d28203f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ee9d23f74c97045d99897e3674c78e49/mewewebokedi.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/44358b01d87ea1335685689de81e2463/madirul.pdf
    • http://rideabikenews.com/user_img/files/26483908003.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/abr7afd9ga8thk7stol7uhf8gq/65379354539.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/cefce4d3db55054bedefc5113f04d306/wijupubuxurupovofi.pdf
    • http://codienlanhminhquang.com/upload/files/65668882517.pdf
    • https://schmitz.cz/res/file/20234217451.pdf
    • http://waterreducer.cn/d/files/94940542589.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c8ce91079---46121032945.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/bd1df500a0d1cd5f3f5aaa06e1cd5afc/74001934355.pdf
    • https://werbemittelag.chupload/file/49565049918.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7425fd69c1---bowerumuxozonebiti.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/54050045004.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/15981589049.pdf
    • http://aldara-latinoamerica.com/userfiles/file/vulitinufamem.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ae7a01854vthgb1tb3hmjs0kbn/rerute.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c804b414---nodebovago.pdf
    • https://midasspa.com/ckfinder/userfiles/files/rajutezik.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f9061427---12300569223.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/337f32447965595f099c93ca307d3e19/tunajulovozotu.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16209207416929.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7af3f396044268303f1586c6429cb062/rozel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=in+what+type+of+cells+do+photosynthesis+and+respiration+take+place
    • 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_off00013f50.bin
2e4c5d115e6c9bcf83fd5ed2287a831a94d98cec79a17cb1ed004faa261ab19a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F50 18680 bytes
font_01_sfnt_off00016eb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB1 16792 bytes
font_02_sfnt_off000186c8.bin
fd51dfe492d322b364c3b31d610b7013c200fba2fb961f6858a0614d4c73e7b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x186C8 10960 bytes