Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea8998f0f95ba1d…

MALICIOUS

PDF

100.7 KB Created: 2021-07-02 18:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 45654860f41e6080bd61fb46142038fd SHA-1: 51b88236182331737fec16a1ba70afe4a05ec1b4 SHA-256: 1ea8998f0f95ba1d78d6d38cf8d9c8d6c701bb93afa3f419744c91b3eba92e2a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=virtual+icebreakers+for+youth PDF link annotation
    • http://uralinteh.com/uploads/files/witirufurat.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2324d671d---46939623239.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/zuvufewefozakalejojuruje.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/f6f638d29b003b50e4dc0a0e91bea9d1/30114868237.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6ak2pg9vsgcj8e1f1qb739ndl6/tuduwujumuporokow.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/66129985523.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/41ab59f6a37e93e862d7bbe03adc3b73/wamuputipotas.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/se40t4a1k19iq6h18848ghju0m/30204789397.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b33eec5707c335ddaf9eb217833cbf3c/81286370709.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c951e2ab03d---fakusu.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060208332973499.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/kovekoxosu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03384a77c---95387166040.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a2f9b8b21---jexusiwin.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/4591586064.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/fe351bc87a0db09e20ac0b6134dc8c4d/46933380878.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/xuzesemez.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/krlsj75ese7i28kf2o8j4eb0pj/34729595179.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c35e684584b---serodarukelememaralub.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jewinedof.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57441ef4---80525642181.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/d0v4um81i3h4bvr9vqr1b5ik13/vorokigapurabomigukizif.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160843e84c3e9b---kokunezi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbb1b4816---wutujajegawesib.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16099abc65fed4---22194910699.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 17296 bytes
SHA-256: 59d5ebcdab6551c79e89e1d00af559e0048a8bfc508c9d3edbb7c025f6902f11
font_01_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15709 16084 bytes
SHA-256: 2af06ec2bd43dcd7882560ebe4d44766a7733a9e6da1b8a7754d296041b248b9
font_03_sfnt_off00016c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C36 10744 bytes
SHA-256: a9e5035c220c088f35711807f7a4121e7efa2ee618941072996710c3e931405a

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