Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ff60e50ead3048…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 11:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddafcf70850ef0f3a803b58cf3dc7084 SHA-1: 8def7d3497b3b7ab852b9a3713d23e736489b79f SHA-256: e2ff60e50ead30483ab6fa80ef1824a36cd80bd5ac5ff9c2b96dda097f5da2fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5623

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=how+to+download+gta+v+on+android+obb+file PDF link annotation
    • http://qtjdb.com/UploadFile/2021/09/08/file/20210908_000823_108.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/36790698088.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/regibazugabovezaridoto.pdfIn PDF document text
    • http://intertribo.sk/files/77436752531.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/58961939459.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/85300653079.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/duralebu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/jarolufuvegawowe.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/27048198520.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/77720355582.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/81208207231.pdfIn PDF document text
    • http://air-con.ru/upload/files/66021505856.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/19309586654.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/64118119904.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6fdf04ba---kewajejefaxako.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tevafoterasodabomu.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/ravijegonuvibofi.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/teranobaduma.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd316b4ebb---41548322744.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/detiwosuk.pdfIn PDF document text
    • https://penal-garazh.ru/files/5126554918.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ac16d70668c1db83c578de1d927c50f6/xeradulur.pdfIn PDF document text
    • http://myredm.ru/uploads/file/tutimab.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/jaronivelulajobodajaxuk.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 18080 bytes
SHA-256: dc117ca90ab9f396ea2f78d1a91d45e1e93e2a3dbdb400b18e9f2f0ed064f563
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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