Malicious PDF — malware analysis report

Static analysis result for SHA-256 7229e463b9ba8fa0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 10:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c40c7b95c956711da82099756e8bc3dc SHA-1: 455bc1be9047defda31b8315703d9099f7729446 SHA-256: 7229e463b9ba8fa05e87ee79e2f1255f0f9ee995a2a539bf3a87b854733606df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://ttccid.com/userfiles/file/17173744862.pdf In PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/78036252415.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/29487420089.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57ecbcd1e---29992878256.pdfIn PDF document text
    • https://megalight.lv/uploads/files/46434485627.pdfIn PDF document text
    • http://retrofotr.cz/files/file/kidugozitupawafuzo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5d9957c74963b847230557d4f70a4cb0/69348606423.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/forilamexepodumixofa.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/xuxijadifuza.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/vufuverekuxenojomi.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/petabuwisatupufipazurudut.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/67469033344.pdfIn PDF document text
    • http://polipack.ru/content/file/25225043156.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nibewejegutagolelibenag.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/lofuvuva.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/47452301764.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35e4efa2f---tajedopagigefizugido.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/lodinatof.pdfIn PDF document text
    • http://freeorden.com/media/file/79306175090.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a508bc91---jilopiriremagup.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109091916035137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tiny+toon+adventures+buster%27s+hidden+treasure+download+for+androidPDF 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_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 10952 bytes
SHA-256: 324d37066764b8a1fbe1bcc0f55319b838c49fcb48c381960434a379b2cf6061
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 18052 bytes
SHA-256: 6c490c46934e94267a75383a88f4f84a04238a04e87a237b6d6bdefa137d5809
font_02_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1