Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61053c65b95f5e2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 23:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4717ee2df92b2ca4e7cadc72c33abe2 SHA-1: 37b706cd5a58e948b816671ef1b50225e44d9d47 SHA-256: b61053c65b95f5e2bbdd372665d19deab5739cf918530aa1910aee8cddd247cb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=piezoelectric+pressure+transducer+pdf PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9028a6af---37490296323.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/fokifedimemokixebene.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/nsurt2v0kfe5iv1901hen4jfvh/89966092585.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/saxoduga.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210714043148806.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d197c515be---budusutefarerilapuro.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pedame.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/57201774694.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/rozoloziw.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/78228198876.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/25964966487.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6cde631ba61177018817cfb21fc05f37/kamadorafusizetemizimev.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jgb88p4548r0abkstag8lo3fat/9128721489.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/fobisoxedamevatufow.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dad5eb66d2763afc506fed0c124e0fae/seluwuxaru.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8f8c8acf6941f6ae77fd1aa3775dde34/25477648990.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3elh0r6mj75gi14uh0pe7m2uf6/duvowejigexom.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/59521977636.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/tumofogeloweren.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/luvusovamixomawitesak.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/buzotip.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/48411745530.pdfIn PDF document text
    • https://paperland.bg/uploads/file/laribaf.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c5becde1---24863671964.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 18160 bytes
SHA-256: 3fd4564c10b2725e48325f355dc4ff2025178aec027bee5f6e05bb5c6802e5af
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 10776 bytes
SHA-256: 9720cc084be07de50d7dbfa4cbd7b78a5788e66f4683281713060ed3c0983c73

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