Malicious PDF — malware analysis report

Static analysis result for SHA-256 918e40c105fb10ad…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 18:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 172b154554074a125747a4788df1a153 SHA-1: 115ad8d0717be4c2d1369e42fc49e818e21f27e3 SHA-256: 918e40c105fb10ad7febbfdf23d0fc7f1ef93b29d29b29a173f06696d826797e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of brand-impersonation credential phishing. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The primary lure appears to be an Amazon-themed phishing attempt, directing users to a link that ultimately leads to a compromised WordPress site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+iptv+playlist+for+android+tv.
  • 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://ixiu-23.com/uploads/files/202109061257492607.pdf In PDF document text
    • http://sovaimm.it/userfiles/files/73847941481.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/98761924033.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/doseriwova.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613571e299fcd---16651111714.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc1362dbe---vutarogikogilediwiduver.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/61849142394.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/woroponofanajezejezi.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/87536467105.pdfIn PDF document text
    • http://jljemc.com/upload/files/88068759544.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/83497348263.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/venusowitusofosijojenob.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/mobutiwodewuwitenumitima.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/39565933389.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/wikejojokegitidirixugev.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/46677516014.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a4f2eeabcd0cd150cd67e3dd8320c430/8171815692.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/damerimapipubogovoxezi.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/58001261097.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/67678469966.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/jowejogexuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+iptv+playlist+for+android+tvPDF 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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 18112 bytes
SHA-256: d58723e6307a1d032cbf7424fdc40afb5e2e56d699f6a92b0aa9b4c8bbd473df
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 10648 bytes
SHA-256: 14e903785e35158c7451314cf53f8a5ed468b5dda8e7bebd57b184ff18a6e40b

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