Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1ebf1a58705f3f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 05:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d12fd603489c8ba55d07007f03c99c1a SHA-1: 23c8d6d5da7b54fb3eb5f224cef832aa64985469 SHA-256: 8e1ebf1a58705f3f8505a9f0c30e809668e7da42aa6a21247ee14bafa1b76769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=nimcet+entrance+book+pdf PDF link annotation
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8595f6fa0f---9887005484.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/307eedff7c709b1e149dcd2bf4377930/lidupuxebo.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/12123238543.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/83378718280.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/63205125379.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7bcadc51---23753327411.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/73064247097.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/95221801468.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/gezoronitimu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/dukikusoruzelamegezegem.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/pukuxoxajadabuzujonipi.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7510e24c6---vasuleximenazex.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fc2512c45cf066b6a218640279064733/15173405542.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/wonazivipafelerepaxufeme.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bd3c9fe52---73168694412.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/73728873713.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8b600885f876d99412c73a0493496ac5/tijunep.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/53966741280.pdfIn PDF document text
    • http://secretinvitation.net/images/files/98074422026.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/besipu.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a972ca83f7bb4ae77957ddc026a13ed4/finidepoguwomofiz.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01fb040e14---forajopesafimizalufisiwok.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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 17588 bytes
SHA-256: 4b69bcf2ae22c2c9276d8c5ddbeb09d448cbdd8f8d7553f4f2f915c18bbc8158
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 10776 bytes
SHA-256: e784512ecb58f57fb16e1b0e6dfd30c1be220d2902fd7ced7aefd9db22dfb6d4
font_02_sfnt_off00011d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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