Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bc6eb520339b8c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 08:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d510e17ab225b65dbb32439904b0ed9b SHA-1: a642cb570831cf2c5648afc6a23cd40c4f0c8d1e SHA-256: 73bc6eb520339b8c070fd93236a8f9524c6e340c099c7f388145c1be9e9d799a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to domains associated with link farms or compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=star+wars+labyrinth+of+evil+pdf PDF link annotation
    • http://gibkrakow.pl/uploads/files/11661725867.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/47676566709.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/gijulebuziweronuzirob.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/15854543828.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/77324964361.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/6200811478.pdfIn PDF document text
    • https://mangallagn.com/images/file/vagag.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ccade6619e600f99ba25a1cf47b24040/tanokeligevudatowig.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4g2ecmeclr0hjb1ci8hvm1q9f5/21908593866.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/tivijejijuzewixujotovad.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/18775734236.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69486579375.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/xomixuwijisi.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/86480360723.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381062d2128---gavilapanimazi.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/78525077600.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/genogivitewulesoriniko.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68527154285.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kunuwegutisikerifid.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59fe477bd---pifalopepajebire.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f7e7c4e1f---74368938538.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/godapaxe.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 11076 bytes
SHA-256: 84249f3d2fedbb5ca6a873d26166c9fee9820358c3e5267978e0e67b6b9e91a0
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 18432 bytes
SHA-256: 2c148f0a7fa0c3a252f05a9e34f8093a4b9037ae28044ce683fa9697b2bbc619
font_02_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.