Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bfd98e9d7826cc…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 15:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 568086d4fede2f72b5df26d0e1ceb84c SHA-1: a437ff7004947bca9d2ee9082c600debe5307651 SHA-256: e1bfd98e9d7826cc2249c80df2c911beb108903fb24efb838caad0bbdb91bb02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be link farms designed to obscure the final destination. The document body is heavily obfuscated, preventing a clear understanding of its lure, but the presence of external links strongly suggests it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://underworldgear.com/admin/images/fckImg/file/doreriwupizi.pdf In PDF document text
    • http://akvari-um.ru/userfiles/file/damesat.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/jazidomuvoposowupisaruje.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/22487940147.pdfIn PDF document text
    • http://eternaseguros.net/files/files/68439878320.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc6e37388---9820106931.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dc73198338839695135fb0b843d09e4d/46584334410.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/tanezugitexexiwub.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613185011f249---24553853548.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ddda57370---dogifufugatedeburalode.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/97570405650.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98337368133.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/kiverugirojupar.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/lesupagem.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/28258972099.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/65459251312.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375b210a91a---99668279052.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/zubetarilujalumo.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/20890777652.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/18550799896.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/73674857592.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ganev.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/48836710018.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/46224517230.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b68ad23c---43134204344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=las+partes+del+cuerpo+worksheet+pdfPDF link annotation
    • 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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 20456 bytes
SHA-256: d507d2254cb1e100886d68786e142ddfe40d3aa39ce824fe3c1ea3778cee05f6
font_01_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 10756 bytes
SHA-256: a0bab192c09e4cd74bfc95a4bfff58cf60a524ec4d20a44e9c3c5ed16a45e254
font_02_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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