Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2963b5071d7b2a…

MALICIOUS

PDF

90.0 KB Created: 2021-09-18 21:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15082768dd3f8660562ff86e812b2c03 SHA-1: a33b91d33d8a3968da04d544bc06116407ac4990 SHA-256: cb2963b5071d7b2ac83a0577b46439da38fd916599f570fe69edaa2ca14aef36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress upload storage. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tybistanbul.org/resimler/files/49520670051.pdf In PDF document text
    • https://caror.hu/ckfinder/userfiles/files/17670858692.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/piravabezo.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/72421207350.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/63074953078.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/15435987310.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/nuwope.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613986235ee14---bimipa.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109172133527276.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/semolora.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/38938872644.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/5155451660.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/28193618984.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc59e74f7---geweninudajuwatosugiwute.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/bodudimu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/teburesaronakesewa.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/wasugitidegosuvovikakovo.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/jafozonepozepeguguduf.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210908193855.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c24301e839---97041189351.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/43479302080.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/19526279030.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/042485bc833c0c2b64ae71ecd60366c4/90787776173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+universe+in+a+nutshell+pdf+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_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10808 bytes
SHA-256: 62ffd8002a1760fd68b15099d1a4b12991667fad49e489515c7b213472367cde
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C11 17648 bytes
SHA-256: 6ee937759d6a42822b4eb743166d9222b6a7be3ee30caf3d6bdb6f5fada23c57

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