Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc1d9b7eaa34c17…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 08:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 107b443a401b7e4f811760a0a66fc41a SHA-1: 20eff41214101930d5e2ef6e01bd8c29a26c899c SHA-256: 5bc1d9b7eaa34c17a6841a6de07e522f1e8846670ef8fc5cd969d31a101047ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggests an attempt to redirect the user to malicious sites. The document's structure and embedded links align with common phishing tactics to achieve initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138faef586f0---82724813082.pdf In PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/firagidimeduvabefiso.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/28972208020.pdfIn PDF document text
    • http://cutskytools.com/d/files/32993493184.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210905055348.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc00c8dea9---jukatewejaxuko.pdfIn PDF document text
    • https://harom.ro/files/file/91974808604.pdfIn PDF document text
    • http://netflor.pl/upload/File/sitowateridesatitilim.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/tizonam.pdfIn PDF document text
    • http://prograsifkalip.com/files/90915114165.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/3744807587.pdfIn PDF document text
    • http://keramann.ru/uploads/files/44480416562.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/nezotepoxuxunipajupune.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2c72ada57edd86c9148eace35b985957/76575884108.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/nejewidawo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/16189516191.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c866eeec---67900655882.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/89770006702.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/28101061951.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/25394262777.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zawivumumizafevebipute.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/ribujukusebotevoneloso.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/tamez.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/62432452362.pdfIn PDF document text
    • https://penal-garazh.ru/files/revopufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=game+tools+apk+2020PDF 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_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 20896 bytes
SHA-256: d186e60a20b143677175e7d7fb5963a5a9442ba16f30804082ee16aa2ca5901b
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 10492 bytes
SHA-256: 7ee6d65e4d39f247c1e0a4e6c6aba9a33fdee699433e224523a524459ad42bbc

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