Malicious PDF — malware analysis report

Static analysis result for SHA-256 9027c4becf3c0e76…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 11:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8447ee789741f6e92f05fcda7166b5d SHA-1: 3528c9775be813e08e1dc73019bf6cf2256cbf84 SHA-256: 9027c4becf3c0e760c383017d9acafb4dafe0c6e39a94d8c4456a68d6f6a42f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=android+phone+transfer PDF link annotation
    • https://oncallanatomist.org/ckfinder/userfiles/files/78214158932.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/3327360742.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/tadodotugu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/lukubidokizemimoduvu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/14190944200.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6249a7523---muwumigitajole.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/95276378870.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/95650344561.pdfIn PDF document text
    • https://ghnservizi.com/file/54023012400.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/51899654994.pdfIn PDF document text
    • https://businesslife.com/content/files/satikilexovegapap.pdfIn PDF document text
    • https://tepihtrava.rs/files/buduvezuwejuzekaxe.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/popexul.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/1333353898.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/28629400132.pdfIn PDF document text
    • https://venus-forever.com/image/files/36778803046.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd47c9dd12---sujomum.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/vuzovopowisiwe.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/tidokalijawalekabefesu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe95f25d3---1163721260.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/gorabukapejapigefanukupod.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vumurirewolaki.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_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 17620 bytes
SHA-256: cde7f879bf5bf1b22114ab4f05303b0f66e156dd6f382f6b7c8bcb0279507a86
font_01_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 10528 bytes
SHA-256: 1bbb64de1ba1eebb833044a45beed8c5ecbfcd9cce6b4d72a05fb9b682b7da0f
font_02_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1