Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b4d4d5cb500ab6…

MALICIOUS

PDF

93.6 KB Created: 2021-09-19 01:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d1bdc824721aad6382644bc6696e6b56 SHA-1: b04063e85f573fadab1ce404d823afc83dcedcf4 SHA-256: 13b4d4d5cb500ab64e16ac9b182dee40f5fe57bf5ef89d3edf4b3496b585296f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://thanhnhomdinhhinh.net/uploads/files/44388303393.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1dtislqs0ivsnrvp08i97n8ihp/77017755623.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/93829557660.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/76895832685.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/gigowatakirudelasedano.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210907200018.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc0378f1c---pakiboxogokewez.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kixofitixejefowowiruweva.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/jabazakutexodijo.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/85366673084.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/53806335542.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/57174334362.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130990fc8839---rajinemexawakomireberal.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/76618145864.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/81114381110.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/fopegikixas.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/7411718868.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/95479647252.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3dd2ee657---kinowukobikezemesebubiz.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/53199666172.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21026602010.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/8419047193.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/761096b2f6324f599a32de4f52c2c019/jexazu.pdfIn PDF document text
    • http://vodova51-53.cz/files/78276100791.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/kogufugosoxezusotovuvugal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pixel+launcher+icon+packPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 10500 bytes
SHA-256: 516b94292ee41df5311a2b262252ab392be375d65de22508094ee9c1e4bcab82
font_02_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 18424 bytes
SHA-256: 89182f43f0d39b41d7082280ab81d72584b6ee65977dde06f127973640887dc4

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