Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89cc358a22a5a35…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 21:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55a9c13a627758fb0023c82b9830f5e2 SHA-1: 2e2b6a165d318427388fba80c7396882b8428bc8 SHA-256: a89cc358a22a5a350edda0bb09d6157382feb92ba44b1feeb035e1296a4b6c1d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://rowanfamilyreunion.com/clients/28915/File/47353883158.pdf In PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210528190451.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626889495.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fbc0cc011---344616061.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/66961066995.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c478c903b---26257761363.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c54bc02c8418ca967d8e95affec7ea5a/temidijeremolawalupu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160daa94c1ee6a---73175670032.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/wifojanebogonisob.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ojr0tdpele645lt9b5sojenop6/tamejozuk.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/71812782595.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/1425367891.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/92894023474.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/753d0273aebfe0e3750943fe8e440305/kobitutiponam.pdfIn PDF document text
    • https://actorconseil.com/files/file/penegarakukogal.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cbdf98a29---49007839816.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/26017201862.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d072b3901---nixirujolemobomir.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170528cb9c1---vipapigofuxaxedawaka.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/50393002999.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/71358282623.pdfIn PDF document text
    • http://carszana.com/image/upload/File/fumidijidugu.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/25625147882.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0nflsdqtmh936j2jfbd4nbdscg/78807964536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=word+document+to+pdf+converter+downloadPDF 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_off0000c3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FE 16844 bytes
SHA-256: 76b598d30480e348b02e545565baeeeafdf6bb6e28680d6f31a9a4602aa0d02b
font_01_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10768 bytes
SHA-256: 5d6c95dd87ff54ff57c70f136e5942455d3049284f167128472937d5b67549c5
font_02_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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