Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d19d659cadb1ed…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 20:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2566dbbc42550be376071c94a25bd5ef SHA-1: 09c03a047311337f15131e04e4942bd9120e86ed SHA-256: f5d19d659cadb1edeed94444d5e17c7f78eb7f0d235ecc132e19e86e43bd7ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0644a255a---dibidajotopalavulex.pdf In PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/vofutevuvozozirikevusape.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/jaxadadodab.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rq9o9adlauten6trv97o4tsa70/85361234349.pdfIn PDF document text
    • http://imaginove.eu/data/Files/69753555920.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/2942299403.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/62424399185.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/9448405455.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f09cd45e07ff81a6053c02e5e338906e/19119232670.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51a20df376640ec7026a4927ac7087a1/5950147398.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/38620774429.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/76582024717.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/95736930806.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/23826777088.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210730153035770306bci0omyb9rz3.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/78700461271.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/bodibuduva.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/legalrv99amds26urq397l7h4e/xadesixalonexafuzuxo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/71875369251.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2d6f097a---35313653193.pdfIn PDF document text
    • http://fpole.ru/sadm_files/88682319127.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/25802482019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cultural+heritage+management+plan+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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 17600 bytes
SHA-256: bf9c0672c1bb0248392ecd16c1b814a182c0f3f859116dead205b1011519c552
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10788 bytes
SHA-256: ba4ea07daaa82e9d3c254f296ee32bb5f41ddff210b4e42e11f953441eaa1c23
font_02_sfnt_off00011d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1