Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba5dc5801a9a241…

MALICIOUS

PDF

77.8 KB Created: 2021-09-25 13:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04ea4847846b5787c432c6927f557856 SHA-1: a5c6bec55c1cb84277132e92758570eb7720652a SHA-256: 4ba5dc5801a9a241b26da387a7447b05cbd783fe384720d88153cb3dfea6fe29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pixomot.ru/uplcv?utm_term=where+can+i+watch+percy+jackson PDF link annotation
    • https://himalmanpower.com/ckfinder/userfiles/files/nobutajijixavaguwipe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa798d574d---52798189809.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/40193112064.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/85144298879.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/34883755957.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/90949725669.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/futupuwitenaravefudunori.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/muwuwemipavobulutek.pdfIn PDF document text
    • http://go-forum.cn/upload/files/gezoweje.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/xeraninutelujewavuw.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/mixazudozuvel.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/24522219410.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/83181969733.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e69aa026126a454bfc4a3854bdd201a0/94615118061.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/retunerete.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kuzagasirabobixonud.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/5740875745.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210913_3DCAA126841D582C.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/81000910685.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452c2ed6881---45034741543.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b011fed096---refawozak.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/wodujadotimemixup.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0b44cd3a0cdf43d254b1ca07b182f2c8/burer.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/lizotimeketozirariw.pdfIn PDF document text
    • https://cmf8.ir/data/file/zilutes.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/sexawokunifunol.pdfIn PDF document text
    • 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_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 10840 bytes
SHA-256: b6eeaaeb30add95be2e0aa5c71064d010f3eb5de592f96cd7f5ef0444d8d12b7
font_01_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64E 19584 bytes
SHA-256: 97439d37466d4f512ea405b1f5fc27ac218203822d0e7944fc28dfe8d23d8cca

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