Malicious PDF — malware analysis report

Static analysis result for SHA-256 15148a3511f4a756…

MALICIOUS

PDF

120.2 KB Created: 2021-09-03 13:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90a37c7a35f2901fc3db745dc87ad741 SHA-1: e16cc705f3a799363d968dd6a7e66a4b5b799c92 SHA-256: 15148a3511f4a756dab0354feb804db9734515d3ea82fa43617b0240efaf1e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://epodhajska.eu/UserFiles/File/finezezotif.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b992d652a93d203975c2d54737601539/91447983968.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16095c45ce7376---bikemafobomavosopulo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/78ade323ebdbe61623639895a2d8f9cf/vozemipavosep.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/84585488224.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdf3a92e4---60895323796.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/nomewozukoduvepix.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/bafufakaf.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tekosematoboz.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/gajozisojosebakivejamebuv.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/povafo.pdfIn PDF document text
    • https://digireg.si/upload/xasubisanagakimoze.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/5757338896.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/feraribubizuzid.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/71272969157.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edec83bb6---89700815390.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/wasekobivebi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/af0a3b670aa9012edfbb415a1e88d9ce/26376881338.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/53e566353bd032887826e6412c272079/89161980765.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/sobedesozinigi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038e58e54d4---49969500741.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/54980335465.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/29fe7e1feefebe5e2d111986cb32a2ee/rumesofefuxafijajudarifag.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/066c06e510f4e8db44eadb6b5d5a0d5c/63253624902.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084692babe9b---rarivilokupavoreman.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/vepomezujetugozutunuzofes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=aperturas+de+ajedrez+libro+pdfPDF 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_off00016e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E24 20764 bytes
SHA-256: 66ef8f198a9da434a616f5956d0a95e7f26556e38dbab4b9435e396a49023e7a
font_01_sfnt_off0001a231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A231 10800 bytes
SHA-256: 3f12e80248485d4fc47eeeed48cf5e78886a487f70f4b310e3d1d923fc225801
font_02_sfnt_off0001baf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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