Malicious PDF — malware analysis report

Static analysis result for SHA-256 a892e7595d46f8a4…

MALICIOUS

PDF

91.8 KB Created: 2021-09-16 05:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e87da8183cd66cb94072d2f3506b2e78 SHA-1: eba348627329e9bd2a0d98e18d92a4843e88013d SHA-256: a892e7595d46f8a444dd39105fff7c24b317bf0af30c35484d045b932153140d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613387869b414---wimemixobeb.pdf In PDF document text
    • https://groupunsur3.com/contents/files/62419181393.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/99246282051.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/xulukizarajuwozova.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/31631981446.pdfIn PDF document text
    • http://preiss.at/upload_files/files/terurozobivoje.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/gowatawoluduxolijebim.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/39926250777.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109130825333569.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_CF75F3BF7153BE24.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/1756890683.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/fozivimagaterakoxufu.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/zazejedinukarenisov.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b33140bd761f63d4c43ab6e1c6b2f13c/korewitakupixaxom.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/29476286836.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/36237910238.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/wuribelobowaguzabeto.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/81220480306.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/26225085963.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109130726371320.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9d44b28a32b2c1a2a42a8cba4ac86a70/vuvolixonexowaregusexu.pdfIn PDF document text
    • http://alptw.com/images/files/75161703185.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109072107315796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ppsspp+games+list+download+for+androidPDF 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_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 17956 bytes
SHA-256: 20ffdd2696635b8df37a310484ee0a2e7db568ee7eb81904a8d3c78bc5bb5150
font_01_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 10928 bytes
SHA-256: 4315ddedaa4c9e3408877f2ea13b12af76de9dfdb6eeba9c50c7c5c03cbcffc6
font_02_sfnt_off000149ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1