Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03a7f5d946057cb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 18:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc17d403a4175ca437da6fadc6336561 SHA-1: 02c2fcb5500cfdbf7d519c6cdb8b3866307b7ed7 SHA-256: f03a7f5d946057cb299150c2b22ab0c2b07e73abc6af0a1bd639b6710b4a3a98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. 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 embedded links are indicative of techniques used to deliver malicious content or redirect to exploit sites.

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://sdhouse.info/ckfinder/userfiles/files/lojonekusesififepalogif.pdf In PDF document text
    • http://stefanourso.com/public/userfiles/file/37852664097.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/78930900517.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/lamosogeximaxu.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nevemubogagez.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/9507531834.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kajenasax.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/robekasosaxenigor.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/87626772463.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6cc632eea---27206930252.pdfIn PDF document text
    • http://sb555.com/photo/file/sewixadapilidifulesipodor.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/rukufo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/daa7ed82760430889b2a12f18c70e2fe/43941509059.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/setosurigi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260eadf297---90028230388.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/74638122512.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/33858649726.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9fa09233---24520326396.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ebb507d3a37f9cd8c93d52b9e2760fb5/62891425541.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/65435040654.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/36225788942.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161450dd31d844---22758932248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=inkokkadu+telugu+full+movie+hd+1080pPDF 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 11268 bytes
SHA-256: 8a487774889ed53b8b65c1861f35e91b97be39907112e612befb2fb509c0a9ef
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 18020 bytes
SHA-256: f4efd9a15ca165b29b768ee6cf475d1262b1ec96f9391ea449bb5233fd56f3eb
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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