Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e8006a4c17403a…

MALICIOUS

PDF

164.9 KB Created: 2021-08-08 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 77d6e66ce282acec11cbd61df9957ca6 SHA-1: f8c27395f1b907c3b43ff0c93b5742d5d019bf39 SHA-256: a5e8006a4c17403af0190f0ab41fbe71af39431d9973947631c7bd4bd6963bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://vinhhangvien.com/upload/files/mowevinexiwijokizufufakun.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30b2378e8---75987337992.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/47dde8721148e03edd5c6fa07216c251/38155290140.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/63761273833.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xitez.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78bd58da8c---62216529283.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/58472355101.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b54d30715c455366674a1ffd80548c1c/16669917561.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0312b297261834d2e119f1518f530366/24684068140.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086f76726824---puzezori.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/055758878cc2cf1cd651d9efea6c7bff/logubojirufobefikopil.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/gusiwibotejifisug.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcc2b7f7e---lepuxavuxesosoj.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/862e17b9a23a38ac556fb39a1602f963/94769300481.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xemidinawoz.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a328d58c66f0a4df65f226d584a3609/54846509019.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/dapitiguvazax.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/rizafifedonufurevix.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/5010099044.pdfIn PDF document text
    • https://chp-travel.ir/data/file/jumodemogunefubobobipi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cbff428764be3e80f08929b46ec5fdbf/lutemikifirexu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cf4595d63c4000513f6440dccb722ae4/74718334129.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918111e650---22689632506.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/poxizenedikilu.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9fc59cf651e18f8f6d7f9ac0c1fec43c/turibakume.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/h260gfmi4vg3dmh54stcfh2671/76419821049.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85d93fb3e---fukajexosakiluxagolanej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+sequence+of+the+marvel+seriesPDF 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_off00021e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E1A 20924 bytes
SHA-256: f27f1843c362d9f9f2b0e988e27a851c5bc4d43b5a1020cb4633f41ea498a2e4
font_01_sfnt_off000253d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253D1 10904 bytes
SHA-256: 39660eb3a44a4cbba0ed5d2c600832c46c37bdbbc845c65f3c6d89da7fa30c07
font_02_sfnt_off00026ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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