Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c603ad7253f8a5…

MALICIOUS

PDF

92.1 KB Created: 2021-07-22 14:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0527b9e522c33ac3dca8104fe8a511d8 SHA-1: c194f541c0cb761a67efbe35e561b38d7a362f2a SHA-256: b9c603ad7253f8a51ccead0706c9068e8f46f51078055c1537932c81775a54d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://equantumconsulting.com/files/files/50761094923.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/12ee727c64adc0094dc3941c86581b40/xijagokifagejumojaruk.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160797f7e03c0d---tuvime.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/96476871026.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4946c6fac---86745860500.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61771d658---89939595764.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/ximojekituja.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/eb5db8bf035ecbb8878bba6a4f3feca0/kefapazemikojonexu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/18kebhs8kub4d96t8v0p6fdh03/18086347615.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/vaxigapojoxurasofopiten.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/99386516973.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c6bca0e88c24431474eae9341251aac2/93706172990.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/c3fksj7aukop0187csf993ovqj/batizagozelugoded.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c125c624014---xawabojifaxunazenet.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/75741689707.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9dc27266de98ce470d44a30f00483d97/38519122109.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095efa88e00b---50349379657.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/64394950112.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075709ea77a1---fepogalu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a98cd2cd771092435527df8e7a1240e8/buzupiborajiwodokeb.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0bb35bb75529274d8240c8a9c44bb296/16842582786.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a16d04cc4---91597006408.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/dibukivisidamodikaw.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/77965830157.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/isfhlsk7rcv9toro2g2gi8ej0n/10797894478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wedding+anniversary+images+to+husbandPDF 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_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 17336 bytes
SHA-256: f43dd51a958858e0c3080bfc97a43142ddf28c04d1463887958607b8491bb80e
font_01_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 11060 bytes
SHA-256: 3d7480b9b1fc4a69d3bf844d838d58380702ec938a62d749039a9342ab7e97ce
font_02_sfnt_off00014a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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