Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ce87c6d516ac87…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 06:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3804d7d8de8e58ee5dd958c303000e2 SHA-1: 10e8af0771ed53270fe97d6261e2fca18d96b72c SHA-256: 03ce87c6d516ac87f2abd617d8cbcbc74e1035e7a8d121e075e6f8b63d23eb40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=which+processor+used+in+redmi+9+power PDF link annotation
    • http://105chers.netsociality.com/upload/files/53980551942.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dewidoselulol.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/nexivaroninav.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/95708916574.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/mepisumi.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/93375220569.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/wumigidufepidakivowepedev.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/tutoparam.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e597d76e70---lujigatasibisurupexegul.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161373699b6507---25985932107.pdfIn PDF document text
    • https://siroyensao.com/upload/files/51470115825.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/68941089730.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29c7b2da9---xotaregajopokifol.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210910202803.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/mijubatopeguju.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/15046199814.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/jarifotigep.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bamexowigifira.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614029911a013---23044722333.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/35725569988.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/45871441511.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lodipomogulej.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/durixudumizugugaziki.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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 18120 bytes
SHA-256: c4f277aaef3cfc2707bc74862e0cafae3dcefaf816919e85775c39e6eb6e4301
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 10820 bytes
SHA-256: 7c4a72aae64cde4db516a34b489677578b9a0e2d598bd0acb795b61e06d533dd

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