Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d06b2482bd851b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 14:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f9be93787758be1e400bc62893f5d93 SHA-1: dbd1209276d1955bbec816c68524b274a42648eb SHA-256: e9d06b2482bd851bbdff897cd9d96d03c6ce3f85f83325b64386b461dc579429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to numerous compromised CMS upload storage locations and disposable hosting, designed to redirect users to malicious content. The embedded URLs and the heuristic firings suggest the primary goal is to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kanalprofi.at/UserFiles/file/80612521613.pdf In PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210620200040.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/83952584143.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8845465878a1d6a5f030aa4892dbed46/50736114262.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/64975498394.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/23031345809.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160771f225a938---76210269763.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93c2633060---xuzenabuloduja.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/43757578628.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/fipuj.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc1b8d38---lawumudijeniv.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/kavusel.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5eddfb22bd4f16ce09f46fcefb7e2008/ravitokivotuwopo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607dc36c22bba---26329435913.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vo88jg6d3c51pr40t7r0a41525/siwawelejikazujesefan.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/fapetalozusuma.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41025846d---birakudu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df9839a0436---57094717923.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/97131576504.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f3de9deb---87442550793.pdfIn PDF document text
    • http://skupka54.ru/upload/m/5537105390.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f3a30bff7cb4e17c6a09808ffa53d5ea/gezaserakemisokedezux.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ofjf7e32ne4olpuhkegq2699ao/9716895496.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/1406546589.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16084b90ea3a74---zujososujejixudowigulak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=process+map+excelPDF 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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 17624 bytes
SHA-256: d200231aaa3f25af7f21eab314213fa07a973f84928bd20f4f5c1720ac9cb968
font_01_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 10344 bytes
SHA-256: 82d32f8774ffc0233464e96fddbcd3b906e7fe00c571d3bca7759fb1ddeb59d1
font_02_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1