Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d5bbe2ad0e131d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 06:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01599e03ad37bb219fe11f244755885f SHA-1: 3652a96d89f326d7ebd190e4876b7715f9f50180 SHA-256: 79d5bbe2ad0e131d1f85e7d6e9bd8ab19b15164603527aa8a9253ce794c98a5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple external links indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://philabc.ru/uplcv?utm_term=dragon+mania+legends+mod+unlimited+gems PDF link annotation
    • http://wernitznigg.at/files/25006152549.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/74488228167.pdfIn PDF document text
    • http://eksternest.be/images/file/59230238601.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/76629764285.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/dedf6c2970b23f68301f349df333cdbf/70343954688.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/55870941546.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/85367022808.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/guraje.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/16721360545.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/98308783904.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/sekoban.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/fuvejibobirivatuzos.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/328cf87dcf460574610fe47b4db53091/volewawujatuxomomigajulu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/70125471820.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/vuxagefagulopelor.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/89087545557.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/7208458495.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_055648.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/zowux.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a953354a---rivakixi.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/tewigefozozogib.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/dfc150f3cd1c6e7015bd00ab739d547d/wivenafusivevusuwez.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/lagisefanozixi.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/52593659316.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/belidotaneruwinuragit.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/84373283286.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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 10692 bytes
SHA-256: 92c561751a308114b0c6b3d070ba25a08423b7dd441d78726c8b70cfbb084ad0
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 17996 bytes
SHA-256: d9816ed845b82b2c950851d5961fc075b5ff949ec8c7da1bc3fe8156e66e44c8
font_02_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1