Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ecf09884679faf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 22:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 399b5dc7972f3f0ce2d8080080265383 SHA-1: 79577e2a133be7c7cb17fe602f4e27730eade11e SHA-256: 17ecf09884679fafa82df61f196f438b79d56fdc7716c903a079e83d87802cf6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and presents itself as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://zensushidanapoint.com/uploads/files/15692217637.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab7f71f2d---1571019288.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380abe4eef8---manovonexowozedorez.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/sinexari.pdfIn PDF document text
    • http://inercial.es/uploads/files/zibazupinir.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/47741301950.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210909_188E1861C8A3504A.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/jinulemow.pdfIn PDF document text
    • https://airxps.com/userfiles/files/vapatotisawojubidebeg.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/61406616178.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/82311844704.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/powamogex.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a8b43aa5---zisafexemibenu.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/75477242886.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/dewiwujili.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/muporezelelumilipoxe.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/gogazexu.pdfIn PDF document text
    • https://lazerom.pro/media/file/sorebiwa.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/xudozumumuro.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130903b72464---95859090603.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/78884840150.pdfIn PDF document text
    • https://n-tlg.com/files/file/pamix.pdfIn PDF document text
    • http://iscelenie.info/files/file/50907532009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=karz+old+moviePDF 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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 10156 bytes
SHA-256: 18a369e614fc109b2b57a11ea208fdb735fda3e4a5fe9dad1ae7ebc6ade0a8c8
font_02_sfnt_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 17924 bytes
SHA-256: e575bc0e7dcd14cb7e80df7daa7e4a420b2bc3ae10921c3efa8aeeb5ba8fb213

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