Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90fa08dba540f09…

MALICIOUS

PDF

75.5 KB Created: 2021-09-22 13:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e07e59509d11dbbfa21075c961bad473 SHA-1: 2cff6d4d7b9f3f3fbbbc21d4842962414ae1d4a2 SHA-256: e90fa08dba540f09eaba5710fd3bbc93c01cbc3505f28ee1fe8684fc68c7cccc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://gps-ambroisie.com/ressource/site-image/files/10561137595.pdf In PDF document text
    • http://e-park.es/img/uploads/files/88500613616.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/jenotupamosaz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16147459947b6e---juwukuge.pdfIn PDF document text
    • http://zenkatsu.dk/files/jaxusofoladotibodedidu.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/29544159181.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/karabep.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5f320eeb7e06e0543ed0e2dc75c37dd2/3605364433.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd674bf23---99415793766.pdfIn PDF document text
    • http://moretonassets.net/userfiles/40280335538.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210918_D4141A896A909BCC.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/folobabaseb.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/88820024271.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b0d90871d19cfc11b105bd7314ebae9d/xujozanaxes.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/29731849562.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/86995814649.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/u6cn33boekuugsuocepeh6ktr9/95955530026.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/kovibosuforagurivif.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/22804702889.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/zupadoxef.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/40536061244.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97bec09bb---49480092867.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/gakafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=procedural+text+featuresPDF 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_off0000c440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10476 bytes
SHA-256: e064b3747a7e820c0de8162e08014bf8d825633c89c16d1fd8ba5c7c61bacecb
font_02_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 17228 bytes
SHA-256: e98b7ea8120ae47747b799346a85cc496e6c6f262dc00feb9efd7c79e0736702