Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97547bd257ffdf1…

MALICIOUS

PDF

75.3 KB Created: 2021-06-11 02:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8b917e7c5d12d59658483e9d26e8fae0 SHA-1: 901d6c9fa9e00c445e2b37a9114e8b6de69c9acf SHA-256: e97547bd257ffdf11b253645e5653308e333d24c0773c2919db238c85bb01df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm or redirector. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing or malware distribution campaign designed to appear as a search result for specific software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=gcam+apk+redmi+note+5+pro PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b2k6m8kdbiv1i23nsc9li96g3l/99095504036.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9d5626555629c728cc96b325f1bcba34/suxefafajutevobixusivuze.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607e259ce3f92---82998044343.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1a771a4930f728be2b9c671377fccda9/44882776207.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db2abf362---fipurigufujusewu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/33d081b8757b4f17e4c9b060391b4ba6/tewefo.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/oohnkfdltt0pitlgq46i828kpk/faven.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dl749ed1e89hmhss9d61i9hbk7/42748346636.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c221b89bf8696056898a4ee27dcecc08/50373947633.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95988e93c5---17845616553.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a289893f241---judovipozejureva.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04a781c89c---kedanobuvasokutozujunu.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/fupatitipakonuw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080da92d675d---xigapuxefenifefan.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e2201e8b---85466941210.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 5228 bytes
SHA-256: ef5bd911ad29abb5ef010b203057c9e990ee7865145643ec9c9e5e31d832cec7
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 11084 bytes
SHA-256: 29f2d9fbbe6c851b40f3ab11326c240fe2b228569c40b78791b5eb0f20e7343f