Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a8b7aa77828fe7…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 15:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdf1a6207baf99e957efb5a8ae0e0e4a SHA-1: 515f79abc4d6c61d04c7b3f6f046f878569d72d8 SHA-256: e9a8b7aa77828fe7e63db025bb23eb0533ed323af27aeb672d2ba6db123cd14a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which point to compromised CMS uploads or disposable hosting. The primary purpose appears to be to lure users to malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://mdbim.pl/ubezpiecz/obrazy/file/vodukix.pdf In PDF document text
    • http://jlicentral.com/images/authors/file/1585440254.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e625521e355879e57d1c5bf81690c45f/12264809707.pdfIn PDF document text
    • http://minipit.com/data/files/80455396200.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210703125625_7jc6c5.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/3829411517.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f30f261121---zazexeregom.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d9f12bc1---fokolukevenudebibotasafe.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202108201821194718.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6n4g92b9cc61dct53k5ie01tc6/41574398097.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/65804697545.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/87756540774.pdfIn PDF document text
    • http://rideco.hu/upload/file/946191252.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/da82ec74ca755cb176b86202e3acf651/milogitelajojalidadesaza.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/rovakavobegopuguf.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/gevuredunopuk.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0cfc14e54---52287978874.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/panaduzotigepowitos.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/l73jh2voqdb8ee0lljmu79ukqb/wasitixodasadewogos.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/joluwawunoliku.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/fudadiwur.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/63572134df6c5a7e8ef95981d4c4cc18/remelovakanupiwegakafa.pdfIn PDF document text
    • https://efnnma.org/files/file/99236783062.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078950ca43c4---jopevurakani.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7841c6ab---14015656017.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hmvvtr8kij6km7l8ufp74teieu/vunatuxovikajalexejimokez.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b4b942c8aa715613945b4a086cc153aa/sidizofifisuxodasen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=operating+systems+concepts+with+javaPDF 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_off0000bb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9F 11196 bytes
SHA-256: e5992869cd584a769a35f2a018c9b15327c3af44c1d06f74b51e7e7434be5504
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 15344 bytes
SHA-256: 518361fca26e7c35ca3fd6254f481c9b4d931e93944f1733fd586cc05fe31577
font_02_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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