Malicious PDF — malware analysis report

Static analysis result for SHA-256 d334cd6eca2ec339…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 06:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 854eb5280eaf207de8754f0a1b53d0b4 SHA-1: b187a8c7ba41c46fcc77a539ac7e97efbdf0997b SHA-256: d334cd6eca2ec33939646bb4fc3edeeb75ec7880c299a653be4ecf1ea639c4dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded links point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=sample+research+paper+apa+style+pdf PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a2f8d123dc670792610e618b83449222/bokomomekosigu.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/77019863981.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6smtfoc7erurpu5m3951abestm/49213047651.pdfIn PDF document text
    • http://www.heksan.com.pl/file/53494012187.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c7a2bde3a5fc560c4811ce697e78c4f8/17247443602.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5fsnb1l31dcs81fuuiq3r0ar95/12104905566.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b326c27dc---wilemafomokuzikexabegejuk.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611768d4d5af0---wefawu.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/12338745125.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/xovixik.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/wuwofumudarumotofolumok.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/bodugesitisunipope.pdfIn PDF document text
    • http://jp-cable.com/d/files/leruxeb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bacfede85---ragegusenenof.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ntbdg96mjth65btnukvrf1ef4s/63184648314.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-30/20210730033440296019.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/63158425789.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/23lt91fvp3odh7248fktjpnffe/dituxefuguvusipago.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c5dbd206---gekinurovevuxoladag.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/jovubefefawibadex.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0563b0df0---54094818324.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/39954109527.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_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 18336 bytes
SHA-256: 12a620f2c3854ee6e2e1ac8d5576a89586a5376d024c8ff25712abb050421fae
font_01_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C4 10760 bytes
SHA-256: f2f69054a9e2eca66f0ce58fd9697ed42373e57764a643c7461d19e596d3594e

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