Malicious PDF — malware analysis report

Static analysis result for SHA-256 505d34e697457b07…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 08:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 095b7858703afac9752caebd8958b0d4 SHA-1: 90e0552e6062372bbdc5adb7a1cd54a1183410de SHA-256: 505d34e697457b078ba33d1a65f4bdd760d996d3408392590b958063e55243ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://jfhcoaching.com/userfiles/files/maxunik.pdf In PDF document text
    • http://vitrine-prof.com/files/54351744237.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2fgri3ojbg0ecm0jhk5qn1b71p/75121877742.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613589e291c56---14699128906.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/793tgj2lo2maac1mk7km7krbh3/82606023603.pdfIn PDF document text
    • http://effektfilm.de/files/file/80165701015.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614edeacb9b69---60320759707.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cba6ba688---zoxafu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/19472651588.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/54835703565.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/45941208690.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161426aac0acf1---67138398811.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/29679936923.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/bonevegibule.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/6756433289.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/48131593808.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/97421785432.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/14623866478.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210908033202124736apet3d.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/41347204508.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/242066413.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xozoxilomazog.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/linutinolezelerajafot.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/47598164216.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161396c61b2ad0---82542808545.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c35f735c6e---37543729248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+java+edition+1.14+apk+free+download+for+pcPDF 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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 11008 bytes
SHA-256: 67f11d2a9d0021cf8615a798898d3e9fcd512288f6e087f4d548bfb3f37b5cd8
font_01_sfnt_off0000cc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC01 16208 bytes
SHA-256: aed333e7dfee755de351bf275c0c04c28c981ea6e2719cb3f4e4c7707d00762f
font_02_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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