Malicious PDF — malware analysis report

Static analysis result for SHA-256 4634b4a70a405c2d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 05:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ba63e78766df4dd70e6cf1b9d1a1ce6 SHA-1: b624f54a6f164921049873512b470f7ac511fa6f SHA-256: 4634b4a70a405c2d5749f3d2d1c4418e10f788abdce9fca487b7349e512001a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of compromised CMS upload links further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://medvor.ru/uplcv?utm_term=ipd+department+in+hospital+pdf PDF link annotation
    • http://infinijewelry.com/userfiles/file/tobumisurowutunelogeruned.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/fipebifese.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/67243148303.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/50088433863.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/26390772676.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/52197491534.pdfIn PDF document text
    • https://manenshop.com/upload/files/letiwowixopuma.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202108240037319541.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/liger.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/30572727877.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b6e9a8a2---64890911802.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/zosonutezi.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/vibugebopubefided.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7cnjuj6dnb9eu3sjh03n1lpvh1/95701238333.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d7a8808fe5ad99fa6283578393593a13/67468971670.pdfIn PDF document text
    • http://myredm.ru/uploads/file/vatafex.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160772c12a5c5f---jimasaxevof.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/69663874879.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc3824a8f---57173658335.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/63116255161.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277e661e905---linoz.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/kigal.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/kuxuded.pdfIn PDF document text
    • https://doi.org/10.1787/health_glanceIn PDF document text
    • 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_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 18192 bytes
SHA-256: 7633cef72c611a133e15ef114c9ab57d727f15015b4d8c366f2eb84aa06e7ec5
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 10712 bytes
SHA-256: c23c7c35edc61ceec4dcf1a580cc8d4ba92d5231c628d9672591989c5202256e