Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93a37bcbe3af833…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 07:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ff5792b9d5c8a1e5f5d1d2b7c8e3efa SHA-1: be6d0b7861a22b7532d3e53d30ba0082d9e50758 SHA-256: b93a37bcbe3af833a8b23c5e58cab16aa4ee1f580008818e971a8381695ce195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, which could lead to phishing attempts or the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=basic+spoken+english+in+telugu+pdf PDF link annotation
    • http://showplus.ae/userfiles/files/satejazilerowugamejo.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c22911bc8---34202816520.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82925f9ae---41187188187.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/omtijpkqolke2bf90hhvq6qeh0/39398865127.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210715_133810.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbd6414943---51888520766.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nupizidideletasoderer.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/90e7694d75184684f812a94e7744e89b/47445256238.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/noboxuxipetefaneguret.pdfIn PDF document text
    • http://vodnik48.ru/content/file/gatutoruz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fba96dd83e9---mutofofozopalelefitideje.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/jupulogepajivivu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/db56549d50ac3a8ebc057c2b06820a32/tupokaboxe.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6fb96414---pupolomunoserumutasese.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/87992ad5e0dc70e95e166e0cd7fca9e6/bitelixazikojuzuxadelisar.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4454dd0e---32778650463.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5284_20210524043205.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d7865a309cab63696684c2fbeb78fc0b/pegegitakowomatusijere.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/82386098828.pdfIn PDF document text
    • http://etre-belle.su/images/file/78138362446.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/nefovupo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9177545b---13780025680.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 11044 bytes
SHA-256: fc160e7bf0e6f6fe33ad9338743408715f96e7226584b5bf9a24afc4010f8983
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 20468 bytes
SHA-256: 674c3f096401f41e479815120e3e4c12f5bbadac4d759b600920b13ef7eab98c
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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