Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50cb971eb6e2a5c…

MALICIOUS

PDF

90.7 KB Created: 2021-07-21 23:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14afe60e3909a1749819d72218c5b8e9 SHA-1: 16c523d7b942beeccbcd7f07ad2dba22c8221390 SHA-256: c50cb971eb6e2a5c03c045ab03f6249e509c7f4818bd8bf67cba04f4233a0476
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://acgroupenterprise.com/userfiles/file/vepowutexolabikuzexate.pdf In PDF document text
    • https://planet-for-events.de/userfiles/file/sulurox.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/gisulofejubegivodiw.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/36630750505.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160864fff52260---piriseporel.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/35537618281.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e09315a5c00ea1c87844a2f8d857fe52/wigolixodubakazi.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/tenakusijodokajuzazewele.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/55925426121.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/15521206339.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/60628092049.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/45095997756.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/nigajerel.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/69429018390.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3d6d12bdf459aa0de4c608e3578694f1/22247574544.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pvce89viv6cgpb9nuuu9832ob1/14851131366.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160758c4a328ed---kivujisumajig.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/41498562768.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9358d9600c034a537ee5dcb58324a03e/80544502424.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/93492621127.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/93638411143e45eb8f714134c128e91c/5035536584.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075efa49cdbd---batanegaj.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d67cdbbe551---zifanig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cough+due+to+acidity+treatmentPDF 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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 10848 bytes
SHA-256: 40fa4e6b7236fb0395430bca453329fffed35fd3482f3f79036427a417689ca7
font_01_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 17312 bytes
SHA-256: b4517160ecb7d912f87eed4097a01af040546e34af17727633cd3d47166ac19a
font_02_sfnt_off000144f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.