Malicious PDF — malware analysis report

Static analysis result for SHA-256 74362ef54b1f9356…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 12:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65525a489a35952342b65fcd59c52523 SHA-1: 64cb8b30ab2b04c5626e46d204ba73980af7d911 SHA-256: 74362ef54b1f9356da1af54986ffd43c66c4393bb53b6547ef10a606e2326f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The presence of these links and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=dragon+scapes+hack PDF link annotation
    • http://classtool.info/upload/files/zorodomivelusi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ni7nidi52l1tcs1tgo9g1bjmo0/jiniwavifuzitokemigi.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/lilotorupoxufuwujof.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161430b15afd0b---57625066593.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/guvutukabibegaga.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a0ba7a23c---dirokijesa.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/nuvakitegotesijobivudumi.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1290547974613af404e39bf.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/mosanolupozurajekugavufow.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/xenikux.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/40351394454.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/xeguxuvikulut.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/xumegikosi.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/39474540421.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/19164549788.pdfIn PDF document text
    • https://gcs.kz/data/content/file/pavujavazomi.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/dipurawerotibe.pdfIn PDF document text
    • https://datajournonepal.org/files/28628597384.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/nujununumizopijamovifu.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/5411308423.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jurozibalopesajimunovig.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/51124694888.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/berexinawesozek.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/tonavogigirimame.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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 10512 bytes
SHA-256: caefafa3f5e3c5d9dee3e97ccdde8f0777eddbc7e3a2c8e7c7ace26b20b9a3da
font_01_sfnt_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 15100 bytes
SHA-256: 2428c5afe590722986ae3322719b2287845e8a2e59f0a303e41b3cfc7efa7312