Malicious PDF — malware analysis report

Static analysis result for SHA-256 9327549f9cb87688…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 01:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3761b9cae63e0c61550b892501ffe7a5 SHA-1: ece80db1613b027c8d7e8bc56436cb15ec53e6a0 SHA-256: 9327549f9cb876888475fb445aa7f2ab023aff871d8820a2e38b474e143871f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern appears to be using the PDF as a lure to drive traffic to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://reniuved.it/file/22272271310.pdf In PDF document text
    • http://thunderstar.cn/userfiles/file/20210502040032595637307.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/ruzakax.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/nuzafomenur.pdfIn PDF document text
    • http://mariancozma.com/_user/file/libijopix.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072008f3d873---mikubolikevog.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/vufoxamanatikovawuvef.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/87868647982.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/81574779871.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/senidibotekuginaduwu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7e7772a2---93054035683.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/bejogexoveralizaxuzulepir.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/66da82de73e8acd0390bc304464da2b3/vujajowu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210820085625.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/xasaxubedomos.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210817_CF9037EBDE0D9FB0.pdfIn PDF document text
    • https://mszukam.pl/dat//file/76432701964.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/81438d6c1e8fb5ce64118918464798d8/zomidelizagogos.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210605133508.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8dcc376f4086cf94212b6f4a96af203a/47446847269.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/24450810053.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b934b9e5b5c---8977443711.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c381752e8125fe20d2b45fefad8e4841/57218454551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=diabetic+ketoacidosis+pdf+journalPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/69372965287.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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 11076 bytes
SHA-256: bf9f4c10fad4954b72a7abb036aeffb69d54434b85502f4f5597bfff9b5dc719
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 17264 bytes
SHA-256: 17c77fa634656974d99c1e6ec290163a7985b3fae66b2846c57dcf5a601552f7
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.