Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a4882c103573ff…

MALICIOUS

PDF

76.0 KB Created: 2021-09-30 16:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b4565a4bbf9d1b8b36e23404ce4b8de SHA-1: 5208c900953ebc376b58d1fd60d03e31b87aa610 SHA-256: 25a4882c103573ff42b0efbb1a0d8e3a70f6b5359325fa9386449b6ccb1c8511
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further suggests potential for malicious activity, such as exploiting browser vulnerabilities or downloading additional payloads. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=bhagavad+gita+original+book+in+kannada+pdf PDF link annotation
    • http://zbigniewrodak.pl/galeria/file/bururisifozigetimo.pdfIn PDF document text
    • https://basisnomor.com/contents/files/71712574320.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/81245298316.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/lizajuviri.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/kurufuki.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/gisilebat.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210909132346118.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/49881641992.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/zovimogotajo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/suscllvuapp497gh6u7rqubkgb/37189833142.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/87407764780.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/nezejemoxi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c850095a05---soxonimarovajebapurulomi.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/39916166205.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139b185447d9---tojuruliniruzaxivemiridef.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/93890055211.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/19244994899.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/63648390896.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/82316229665.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905150704874175.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/gamenuve.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/51922148526.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/48874600074.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1632438282f897b38097bd6c1fdaa9.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/lukinogo.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_off0000bf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3F 10828 bytes
SHA-256: 8346114bb6bc24c287d8e08d3b85d7dd730a238597ea8f41a08e556125736d82
font_01_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 18484 bytes
SHA-256: 9dfb67607066a512f10f8b06b9ebef1ea5c6caa2859792693611087180b681ca
font_02_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1