Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38def3d11d2cec4…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 23:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 07a7e3e7e1ab1b30089a12a2fea3f605 SHA-1: 86f30497c7e20b5c3cfc8189960c387153cc8237 SHA-256: b38def3d11d2cec4762cd4a140edf9aa3e419927e369723deb8108463a0c06c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=parallel+form+in+writing PDF link annotation
    • https://zlato-eu.cz/upload/files/54153558007.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/sukoworijubidurojorotomo.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/5487972519.pdfIn PDF document text
    • https://csodamalom.hu/files/files/77892908838.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8e664bd3c7eff34184b68cb34138d9e6/35458615575.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4f88d2d1---93212608207.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/i0jgk6bb92psb7okepj7q5ohiv/xofilogusatab.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759af01d19f---wejotenabi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf40b56ac9---33635389252.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/kobum.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f730ca70a7---lalelalepagik.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99ec36112766d88c419afe47bbe3d4ec/45958490459.pdfIn PDF document text
    • https://egca.fr/userfiles/file/zizekep.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/af1fe8ce30602324126e5ff1c386d057/48030293860.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1e4dd9b627b129f4f74e7b263f9543da/36833516179.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3876de18---nuvavorepebejugesipe.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845bcdef77b---82645427720.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c107ace838d---6861941331.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c389eeb622ea21acb63bec564bc32776/90130020650.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/tapepemi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/h36i47gluq7cp4d8m3jr69m7d3/xefakuzifivunejelew.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b03c80d46cc---51583684227.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/64040581656.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/soxubadixujog.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210523235826668986370.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_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16548 bytes
SHA-256: b86fdc2efc08f81d6f1b13f965cbb742bc1cc8ad4e21e4b0ed698bc07a4f95aa
font_01_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 10476 bytes
SHA-256: 0eb9807abba8b11fb3abf35fb6dbb022df24c1be88f782a54e722238fd094452
font_02_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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