Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95970567b69751f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 00:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df658acaabd1fde1f4bdab639139ae76 SHA-1: 0e2f91f6c94c71cd92599a979605bc5f4ccddf80 SHA-256: e95970567b69751f19ec810a4a3cc046339da76d7e9d620c82f3872d2d030de6
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or scam lure, likely attempting to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=install+phone+clone+on+old+phone PDF link annotation
    • http://kahounova.cz/userfiles/file/63243118483.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/13250606168.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/nozedepebedezudije.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6s8uto50sji38n07dmf59ori59/71680047772.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/33596927001.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210911151225.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/zidixapitowep.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ribisinig.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109150558327690.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/zuvewofumiselex.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/20670421408.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/85666704257.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309e5775a95---75658787617.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/jezelakazunamidevuwi.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/kakolulobajugulabira.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9b636a79157e7c986198a4bee2f28d4/81380445392.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/51093823996.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/nepuxazenev.pdfIn PDF document text
    • http://trovas.com/userimages/renutizeguxabarubik.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/kudamuw.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/silorobukuzizugolowa.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/zuvepeguzepobamaladifonib.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/48336360459.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210902072654.pdfIn PDF document text
    • http://kvrhousing.com/uploads/tibezetovoxiwiwi.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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 17536 bytes
SHA-256: b8165fc249871a0560eb6a915f04632f29f4e19fdc8a3cd6cac251b3ce643bc7
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 10372 bytes
SHA-256: 74e2bd616bbe2fa07dc9c9ace58e926af0a0b93b2e1092c8c2caf2a20ce385db

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