Malicious PDF — malware analysis report

Static analysis result for SHA-256 65abb5b418e9dc01…

MALICIOUS

PDF

90.8 KB Created: 2021-09-12 10:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 68f335dd9271718de6ffdbc9bf930003 SHA-1: ad124023cc0398b3c8ef32f8758ea25d245f7bd7 SHA-256: 65abb5b418e9dc01aab5aedeaf1679cb889a676267fa4e90f988cee1d360d6a7
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm for SEO poisoning or phishing. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for further malicious actions, such as redirecting users or executing exploits. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mefolaradenokag.pdf In PDF document text
    • https://faktxeber.com/resimler/files/fifezegazibagi.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/jemodonawegalesefamo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rofoxujidawagori.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/wevixafibevajiwujuduvodiz.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/8633801052.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/25533652765.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/57295049767.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/54256583635.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/gigalibid.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/5418438065.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/pezagax.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210909070227467598.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/16162000208.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fawimetuvis.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/xodoz.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/zidozeketanewexegerijebur.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/34626329990.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4trc1p0filuv8klf6uo3grjrg7/nifitisajakesipuluxib.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/jukanamopaz.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/14d4c65b2917b8c50da1ef628e04d7ae/nofivuw.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd81fd7c92---36166844.pdfIn PDF document text
    • http://santeh.md/img/files/fuzakivulafetetavopox.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/konekesukojobumixiwawa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/49711948537.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390123484bf---74430825172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+emulator+no+internetPDF 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_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 20744 bytes
SHA-256: 02e0d5b4989c8d716b8f510fe4a10c028a2237d5c65015a6a9661a816f5889ce
font_01_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 10324 bytes
SHA-256: 092aa6b648e624195a521955a93d0dd88a89b167b4eb9491abbdb125189d5a00
font_02_sfnt_off00014515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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