Malicious PDF — malware analysis report

Static analysis result for SHA-256 659d7895894792fe…

MALICIOUS

PDF

84.1 KB Created: 2021-07-04 14:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea2a91d2a62f6b9b4212fc4b9600f606 SHA-1: 30d2db291f2546bf5fd905a29db5b76db996dfc4 SHA-256: 659d7895894792fead7089bfb7b9762821db7be3e7bd291a227c6c5b3d4f7770
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/555a36351950a79914927d2df2096bb9/73123927672.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739ae110ebf---gasexubufofuwexozosilupo.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c7b2e116---joganafubozifogivotozadov.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ao9skhtlju3kvmt3gjvca4kfee/dovokexoz.pdf
    • http://www.bash.cl/media/file/pudawid.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/62153294289.pdf
    • http://pratiklinik.com/img/userfiles/files/sukaz.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e3ebda7c1---58867550893.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/grnk4luqadneql6pmlm3i9thfj/bewevizuguw.pdf
    • http://learningkey.org/userfiles/gigoregujarosevirom.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ebf3a929a2377728b6bd9647683816c4/jaronipakipejikeji.pdf
    • http://forglass.sk/userfiles/file/76108925242.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7083na2v2hv77sbn8a2ht42o4h/nitebalilizijemipira.pdf
    • http://vimbark.sk/editor_uploads/files/35248648159.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f220d5d2---gexemafuxezafitimopaf.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4e9qj7ae5le0jvjqmgoabr1qtp/90778796013.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f87c9bc0c---xepazu.pdf
    • https://festival.bg/fckeditorfiles/file/95983931158.pdf
    • http://elesi.eu/fichiers/files/milupulakade.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9c80a92b3d2cf85b0361fc1f58ba7213/pafogow.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608efd66c342b---lifazirose.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe64ebe83---rigakizazaseseburigo.pdf
    • https://serviceservice.eu/userfiles/file/felitaxadesigiv.pdf
    • http://www.bufolari.com/public/immagini/file/18687173582.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fu5nfjfmmtvcvs9mstmhkho238/danirerakesepifuwosonobez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=drawing+techniques+for+product+designers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e301.bin
4d8bf5620e9678d82b319b6aef79770c64405db200fc4382deec81fb0f862de7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 11188 bytes
font_01_sfnt_off0000fca9.bin
3cf5c6141a9bc4a09e68e393af7710ac83ebc1cb9c163cff7e910ecf4deb9697
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 17856 bytes
font_02_sfnt_off00012ab5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 16792 bytes