Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a30027a5b06a529…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 14:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 62ea0e09d5f6db9f7bfb8690b522d00c SHA-1: 5571a05b81c10dbaaccc147eb3e11bbb0b98e7f8 SHA-256: 8a30027a5b06a529ee86d6e1ddfcbec04edc07c89bc09c6cbdb232efbbe7834b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=calculations+with+balanced+equations PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c0dbde25b---14024594417.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8jk112ro3doljnvso8fe01v9at/63070878218.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/55526629391.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/tebexufeguwokisazavas.pdfIn PDF document text
    • http://nanopena.cz/upload/file/26175824020.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/gusokizudilajez.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xaxeregidazarulate.pdfIn PDF document text
    • http://philboyd.com/redawogavunewagupikugisa.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/befejejuloxogi.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/nosekaxomuzexosipa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/67166706020.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/suzurinajakavug.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161524ad2979da---78932124639.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16154568257a21---25837777879.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/lamirasajelez.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/75596978718.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/wabimasozapujunivamani.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/gakekufat.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/89907107924.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/biliwofojizixid.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/vipolexomepe.pdfIn PDF document text
    • https://123natura.com/stockages/files/97423181818.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/24338090121.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_off0000b1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B8 10872 bytes
SHA-256: 9d2b748dc36a47b9ded2932be0e8e87a083af5baee4bbabf9490ab2ecfa48bd1
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 14440 bytes
SHA-256: 1e7f0bf74737d09974e6b79ebe94ff2a8895637d6ccd1ec864fee4ec09aef936
font_02_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1