Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe99f8a2faab0db…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 08:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b469902e4b87c90479833c2374d8795 SHA-1: 957e39a67a0d96d2e4e8021dc51fc564763a8b7d SHA-256: efe99f8a2faab0dbb3c152cfb67b82edc1222308087f1e966874c3f9132c10a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.escon.it/wp-content/plugins/super-forms/uploads/php/files/64f048f7f61de463c8537ea5677357e7/23172065848.pdf In PDF document text
    • http://mu-rrrc.com/userfiles/file/borimixenotuvixadenelivu.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/woxakifoxelajoz.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/59958529244.pdfIn PDF document text
    • http://ndt-ultratech.com/files/9587060875.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/vivosobakosejikoris.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210618_B19F3A8429176CE3.pdfIn PDF document text
    • https://aitalk.vn/upload/files/lovemepusawedox.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610358cad4054---lolimu.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/xatefalog.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a785c9dc9---37714492368.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/tejevenopaj.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/wudonibefosizalolezawata.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/11737455409.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/23184748727.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ffe1f18893f23b56ef2607cfa2da8e61/50311406554.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/16736083792.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/59625066253.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gutelutobisakozofukanabor.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/57668575223.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ba25413bd---79046230518.pdfIn PDF document text
    • http://zuche0551.com/upload/file/busazakijotawu.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/13678890450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=compound+interest+class+8+worksheet+pdfPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 11404 bytes
SHA-256: 3f05fb3d87bc6bb5fa43fd30d58e6b13e804d634e61e35c8ca621924a9e77a25
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16276 bytes
SHA-256: 0c335a3b8f4fc575b04e88e17834c75c42ba74d43f39c621c32b5fc31b433bec

Open this report in the interactive analyzer, or submit your own file for analysis.