Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a87612915c1e78…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 02:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f59db4af2fc7148924f62f18d288626f SHA-1: 9d58e46805d94fe4e5fa2241d26b78f0c265ef0d SHA-256: 24a87612915c1e78c9d3e773c1fcbd72102b67ad90f0071c031c91da2820e198
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as 'Pdf.Phishing.Trojan'. Heuristics indicate the PDF functions as a link farm, containing numerous URLs pointing to various domains. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ecosdaliberdade.com/ckfinder/userfiles/files/92045164315.pdf In PDF document text
    • http://nickels.design/ckfinder/userfiles/files/xutifozifanokiwuzexe.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/846747325.pdfIn PDF document text
    • http://olympusflights.com/files/files/minik.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/novonin.pdfIn PDF document text
    • http://fpole.ru/sadm_files/bimesiradezomo.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/pudipemoji.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/66101870283.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/78323894094.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce6006874---79467718478.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad69b10a---67651849374.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/85698831653.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xajutexom.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83500090368.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/jegevezet.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328fb3494b0---82097308658.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021914134786671.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fvgkll2dju6ns4o3shgmi9vk6c/lelokalujozazibupozolufov.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/61370157514.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/18859014252.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/32737536466.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d7bb38b5---38073605478.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/29889455986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=naming+hydrocarbons+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_off0000bf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF78 11024 bytes
SHA-256: 3443439a6440e41a37db019d2833fbc5b2fdcfa9682c954a5198572c43488773
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 18604 bytes
SHA-256: e865c5ac742b0ca3668c5e17f0846a84b3d8d04298f87dd704d308690f1053f6

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