Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4a532f1d107008…

MALICIOUS

PDF

85.0 KB Created: 2021-08-18 15:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8f15f6e87c85c1bf461c3c769d9b1b1a SHA-1: 4060743acb29a07e5aeedfcd427e8c50ea62ff60 SHA-256: ef4a532f1d1070087174b04bab00b1c144b30d17a895dbeaa535627bcc8b05a0
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f9e3585d66ee7cb83e5df3075999ca5a/74466935406.pdf In PDF document text
    • https://paymentor.nl/uploads//file/95199844885.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/soxozebopedubasiroleruk.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8955cb55---jovixir.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161054f76ee820---rekasetuvenone.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/65391846246.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pavefopusubuteb.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/70764692609.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/dugujoxawevizivozomo.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/46834169079.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/fowevovatojure.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210702_892E88DAB520A9DB.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/20588780248.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/fujiv.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/xedafiporalubezuxisebedu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/90249805021.pdfIn PDF document text
    • https://silga.ca/userfiles/file/webela.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/91942059446.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607690724f105---lijuwifiroji.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8017ddf3---68372990447.pdfIn PDF document text
    • https://lasanisports.com/files/guxotot.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/99586554eb92190536ab5403472eebb2/bosawumesamaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=connotation+vs+denotation+worksheet+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16472 bytes
SHA-256: c2fce0f9f3387156d46699c6b709c4cf6857c9d579aa3f1d51c286b303b045a4
font_01_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 10576 bytes
SHA-256: 3bda4dc0cad90eb5807bce2297f08795852778f9f73d950cb7e0b8ac8d0686c2
font_02_sfnt_off00012d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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