Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d2853efa6cf8eb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 05:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 947fc59f4b4ec77dff29bac61f6e3f6b SHA-1: 10c5786f70fde85af21153e7676e7aa21062e075 SHA-256: d5d2853efa6cf8eb72c774cb236eaa549d3ba70688d6f799558764f0e490a7ac
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple disposable or compromised hosting sites, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are benign, are part of a larger pattern of potentially harmful redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jedepojibomajomawufagena.pdf In PDF document text
    • https://serrechevalier-skifun.com/imagesfile/26098418312.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/26499685760.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/64170325545.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/57884815383.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/59994900658.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wazaja.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fikabelodugub.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04c2038de---17486584102.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4234c50be098938560edfffdedc3e559/tukovevesarisew.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/rurigigi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b9a34afa62ec69e96d951ba1e604883d/63873991597.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1070dee084e88ac8bd248e725a943dea/kugafijaxeduke.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865e96f7bc---83521452939.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/nejupusemevaxem.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/53522382297.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/birixawidovijadu.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/71305081278.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/84803155088.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/66834730530.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/63792323006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=3+movie+online+mx+playerPDF 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_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 10504 bytes
SHA-256: ba68bc0071b0b7ea0f58d469ac93527a9ef38bf1293c55a50111b496f1afb26b
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 17344 bytes
SHA-256: f317f58b808f393dc0ba6aa9db40e5da6846cafb5702eb84a215719a17df3644
font_02_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1