Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b3b4dd39cd257…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 23:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 229ca4a2c8f8dfcdb966f6278aa292f1 SHA-1: 15efec24cf807ea173637ebf023425a930070c40 SHA-256: d16b3b4dd39cd257d91c0e4c62077ace775c4bcf27ba658088d18c32076582b5
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ketchas.ru/uplcv?utm_term=thop+tv+hd+app PDF link annotation
    • https://kaemsp.org/upload/editor/file/gibolevat.pdfIn PDF document text
    • https://coluer.ir/documents/file/jexanoba.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/63689219167.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/paniful.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e28afa43---13787056662.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210917041914_fv5ftr.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/rinujunazuxilonek.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/pixix.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/nosukagunisubegesoxibina.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/12907274749.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161358f991a16f---77935195065.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/34195696506.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/71466712878.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/rekenexuledirudulevel.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/79389910021.pdfIn PDF document text
    • http://demkapi.com/resimler/files/53241119998.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2fba3ebdc---51448212682.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5fneamju0bohgimhug0m3h7nkp/napavawijepagajiz.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146235fad6e6---59809519475.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/16165927152.pdfIn PDF document text
    • http://bluebossa.pl/files/file/36793014117.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/sakipakasifo.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/rozunukolulizafuza.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/98282590742.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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 9876 bytes
SHA-256: 1e096726b37414dd2f5db71e9dcfc0ad32a2d4ccca361e0bd9f67568bb133513
font_01_sfnt_off0000c60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 16020 bytes
SHA-256: e5f19e007176e9d98a9268c84d7b39a02c356de3b7116e61cd4579bc579edf16

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