Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d64ce1a668a04c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 19:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0d762d4206779ef090d8b645ed51fa1 SHA-1: bd2b990276eb44005970df3c874f6ee55605fa58 SHA-256: f3d64ce1a668a04c503e4b8dfe587fe434f476a744d3cf337d19289138317566
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to disposable hosting or compromised WordPress upload directories, suggesting a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing and trojan distribution. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=download+powerdirector+premium+apk PDF link annotation
    • http://ceroki.com/image/files/83742313644.pdfIn PDF document text
    • https://jin-ji.com/upload/files/70334373377.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/10256540525.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/97825886433.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/fanebikomeluxowovepel.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/da6bbb2ba8309db05e29b09ad5055fc1/gidebut.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/momotapesimifeganitexasiw.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/nowopipekijudun.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/pevoxujofuweribefunopex.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/66561127084.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9b4664e9---58914538688.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kesepi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fc4e44b7c1ab297f7fa6debfd0f09f97/rifanixaxunidawow.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/jovusujo.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/zuxuribunukodabegodoxuwer.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/66402275234.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/memuna.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/fuwivuwagiguvuxi.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/9065902989.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161347e126537a---kopukenesikavo.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/fojetetefo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613067c34f4ad---13837768600.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c363a6d2---xekogutolazuf.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b65ad3751---majajuvujovelepifid.pdfIn PDF document text
    • 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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 20872 bytes
SHA-256: 670f4778d39e818e2c49bdd8387db847fa61129fc3d5af10e9ec067a7f0d85d8
font_02_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 10788 bytes
SHA-256: d0a5d185c12a422653e38a34252cffc721ad760ef95fe3d2e58d31287a5f1ced

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