Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ea8fa008f5de67…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 07:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 290f992998bef4242e51f8aff878d474 SHA-1: 214bcca931e073ea9720d02f48f363fbcdf2247c SHA-256: 15ea8fa008f5de67a0e5e12c6d9ef48533ed3fff9a876232e1fb0d70fde194cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=night+stalker+creed+pdf PDF link annotation
    • http://bearcatbb.com/CKEdit/upload/files/62016941922.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/61337639484.pdfIn PDF document text
    • https://kawanmto.org/contents/files/benefemozof.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455ca3be15---82038543762.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/vamike.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c62479e2---wugavego.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64e51a854---65782130034.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528221625.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/miranoreteboxoti.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/55390711631.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5smbp1sh7fcege55po80bpk1re/jeluxomemenidijovogu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/voseximumuvabulumefe.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92e89b092---27940279323.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3de7cac7---dewut.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077345781874---95451682851.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qs8o7o5c68hlpekhc8un35gi0n/petasenejuvilip.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7e995837360b7b7963f9e11ac737f9be/81094672271.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ae5aa1dd51201efff87d967059dab697/dabofesobuwibawuzuxegita.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/62776620721.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/32768635846.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_off0000c04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04A 10744 bytes
SHA-256: eac2d97d36ba29462179ddc80d8033a3ba0fd6b3de2cbe39ebd6f6aca1f7d043
font_01_sfnt_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 17956 bytes
SHA-256: 3ae9e96361813e08fd75ba50c70a3d744d658dd829dd86026600410a6c95e4c3
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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