Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef222129feee1fdd…

MALICIOUS

PDF

89.2 KB Created: 2021-08-04 07:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 30081b01bc406c59edcb1b3e2e930196 SHA-1: fbc7a4d9a7c4402cc4526121244d5c86ab927b79 SHA-256: ef222129feee1fddbae12a6fcf57c070e21e8e94e54df68efdb2350f2ef7e169
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or serves a malicious purpose. The numerous embedded URLs point to a link farm hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites for phishing or further payload delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://kiuanai.com/userfiles/file/28180219493.pdf In PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/okatkt3kpcgn0r0ggrhiuahjc3/majawutexibesu.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/94232177155.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a59d7db683f1653d4162bdd9b9c689d1/38252938666.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/29010191307.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aec675682f0---73105597594.pdfIn PDF document text
    • http://parentini.it/userfiles/files/62747984437.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5de3e7d70---29088348854.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b69b54f485e68c7b44826ab3d26c753f/bexivisusijedufogexipof.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3176fab9cef2953424c48df42475d036/49785050056.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-11/images/files/ruwubebu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8748ed50e---12171285670.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/31665788322.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/iflgq056oabcn0diqc1qncbq1j/84962528414.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085682422dad---kojapudazobipolene.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b63c492fb5b---29486698465.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/gudel.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/lemaze.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/mubus.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607945ecd6e94---bufiriromojujaxabu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa5346d9b---sunalepogunaru.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/mimofutejoruzizokejajiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=3d+pokemon+games+for+pc+free+download+offlinePDF 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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 11116 bytes
SHA-256: e464f6ddb147d2b2e4ca350df487c16633fe9379db5db991a9249eeea0417543
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 17192 bytes
SHA-256: bab85c418f95594b72b7e629d53bfa82186a014d1a35b6f48d9b744b301c88bb
font_02_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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