Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5b1116baf06ec8…

MALICIOUS

PDF

74.9 KB Created: 2021-08-15 20:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72318985b9631d6b62152b51f84494fa SHA-1: ebe03c3498d27215e141039e50d9f5a926b28c7b SHA-256: 5c5b1116baf06ec883bce20d6b74c1ccdde1466cda1ff6ea7ee130fe2502c4b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document 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 various domains, some of which are hosted on compromised CMS platforms. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=special+right+triangles+worksheet+kuta+software+answers PDF link annotation
    • http://nyitotthaz.hu/userfiles/files/127322720.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/guwakux.pdfIn PDF document text
    • https://asi-filter.pl/files/file/51775288220.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pebijamig.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebee1e3a79---35457817806.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c675b88c2892e1550d073aa7dd9d9aeb/33126347247.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/5225960614.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/magalawirewisekivugadezew.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/bemizusi.pdfIn PDF document text
    • https://codecs.ro/images/file/gilaposebasejavofadojod.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/96743502067.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915f4d21d39---45552415615.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e095fc6a---57576122314.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1kva8lh5k33e455jk71sfkesru/nipufizavo.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/2488305379.pdfIn PDF document text
    • http://soupworld.de/upload/file/31328222986.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1edee7f6dfc7d6b91287c0ef277c942a/daluxatobopemer.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606faeab2d8be---leduwopafekasexexonedop.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9625fd95---monuvu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/v7fentsb3pkht93gb5uq8e4m88/timeduvebuxufugekimude.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0e1b6ea7---50901629828.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0vfq02ooedhms53122o77usvg0/81360661042.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/bepajizexakipotijufe.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_off0000c0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 11112 bytes
SHA-256: 15a4b66dff463ba4efcd41145f5882c816e109e843f233aaed5139aafbba56c0
font_02_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 15916 bytes
SHA-256: 58f8afcd044ef9a78c720441842c05c840e34984e21e5f88f431245305e56882

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