Malicious PDF — malware analysis report

Static analysis result for SHA-256 d587c17b86e662f8…

MALICIOUS

PDF

89.0 KB Created: 2021-09-08 04:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e630504d0c394791c154a92bdabe8fde SHA-1: 970bf69eda8b0a1a0e6533c70db37e5defb9b2b6 SHA-256: d587c17b86e662f8217b6e6d9145fb09c21cb97b881928d47f200e4d6ce4e771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of link farms on disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://africareview.in/userfiles/file/polomolosalasijini.pdf In PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108281707181110.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25ecbd200---rupimapufagekevuzipilabe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b058eaf3136---fafevewa.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-26/46637359a028a30e6872389505ba0f2e.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/siluzupovunumaj.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/bofewawibe.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/g88a3idaaa0s3tvbq1uqm8lo43/59636749164.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/67665073948.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/70526346946.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f62b98aa134ea3f103718a0767861ced/55731191910.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2d9f6c82c---40560418503.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/midukewoxaguzawipam.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/66483595155.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hrph5d5drrnh6i2plvk6bmaqr7/47214438777.pdfIn PDF document text
    • http://all-premium.com/user_file/files/97915300619.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b632c7ec20f---vadixupiduzab.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/2865685652.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be13190e93---nivomibogurokobasavawawoj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8eb81b33142f540bdcc5f33198571e08/famut.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/mafopum.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/69895294170.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a88098c0163---97186780895.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9bcc3eca---90295366651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=asset+integrity+management+oil+and+gas+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_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 18540 bytes
SHA-256: 769fe70fbe474c9a5324e205c49d57afed10555efad98fe9e4be97b786ef18de
font_01_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 10936 bytes
SHA-256: d9966143280f6e82e21c4da6262abce11170b64c0fda1db51ae1e4c2409528f2
font_02_sfnt_off00013dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1