Malicious PDF — malware analysis report

Static analysis result for SHA-256 0246c6ebb64f1aa1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 16:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 734082ac8919595c546f65d81a1b4a5d SHA-1: d0e9bb5e3102fe976ea43144fa25eb15c74e9c2c SHA-256: 0246c6ebb64f1aa14a8692c8afe5e18213d217a28bd1f5c91ae72a1048eb5fc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=lidar+app+for+android PDF link annotation
    • https://himarco.ir/basefile/himarcoir/files/16304796261.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/25878402697.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/40107128656.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcd3b5ab8---85712258136.pdfIn PDF document text
    • http://keyday.ru/files/files/siduvatadiragawowev.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/58238253581.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c41f12bf8a---50293529674.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/60383007147.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/mofor.pdfIn PDF document text
    • https://securitydm.net/slicice/file/78199667312.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/92722779655.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jkubfvriedoebhcqa3rc10i7hr/62750812986.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/mareni.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613242f09bb97---kizenepixe.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/43602392025.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109071534399559.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/72600537936.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopatas.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/85158488563.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bavujifojitu.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/38806693445.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_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 10004 bytes
SHA-256: 5adc92d0405712a64df094fea341376c170f7cf8a5c8581e35b69d38900980a7
font_02_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 17368 bytes
SHA-256: 3d0fd79175d40d01555103ea19d071ffb46a34a7e9f92a73e1842d59320c5d25