Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd1f7b845bcb694…

MALICIOUS

PDF

91.6 KB Created: 2021-09-04 07:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 796240719be21944235498770e01ca2a SHA-1: 29084216af22a76ca4ee2f35e224f84e1733aebf SHA-256: 6cd1f7b845bcb694d73d6476c3cc7b60215ddd9149a7d27422b614fcbe2260dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest it's used as a lure, likely for phishing or to distribute further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vvntea3jv0on8ukug99r2hocg7/6305878047.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4750b664ee55cef826c9acf329a79885/nekenumazerinepijubem.pdfIn PDF document text
    • https://clinicscrm.com/img/files/dusare.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/guzeteximilir.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/pizokulenaporeko.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/gesomujiduxijanobuzijedis.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/73332602024.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612a2c5fcfe18---jutazekenigadesoj.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a2516a4a---wodafipuger.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/5388033882.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01c942173---48905288669.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e155889957f066852542726f4ee9b565/dajaxikimanedob.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/zusefipamasemivubi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/67nrt26i3usvfrsq50lu2ihukh/fewojuganivudoronodi.pdfIn PDF document text
    • http://turnyras.lt/Files/file/gixupovokefagekawolag.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/nopakon.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe77ccb696---marekilixi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083023f8413c---zugebelad.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/lurun.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/96498832094.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/9dbde4140472a9da67645b2ae445d0e6/govem.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/63438219195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ctet+child+development+and+pedagogy+notes+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_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 19668 bytes
SHA-256: 553235757f71e7500f46bc08bf852cb175c145ec315d1a20c2e3ec8f5e85eccf
font_01_sfnt_off00012e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 11180 bytes
SHA-256: 46f50f051c13aa88fac43a4f73cdcf21ae153b18820c51e66868b9824309807c
font_02_sfnt_off00014848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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