Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eff3d164f43487…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 08:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3605568b9c0d6768eadcce5005f46a34 SHA-1: bdb8e53d7717f9c206355d5ff9d8f1a73d89ce0f SHA-256: 33eff3d164f434870fb248489f0d9b78df637b39caca63dde497e75c17f98aee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pcserviszlin.cz/ckfinder/userfiles/files/kunorimotopaf.pdf In PDF document text
    • https://aprilboya.com/userfiles/file/kasubokixukuvopobuwex.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/32173050770.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f0abd41b---vitalefawora.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/71680610994.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc2d34ceb---26360717464.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/62314448420.pdfIn PDF document text
    • http://honghuibio.com/d/files/8247083632.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75271f617---84909919345.pdfIn PDF document text
    • http://123dvere.sk/files/file/rotojunepuvif.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/12987074434.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/dojanufapojekopujilugulu.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/webavo.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/tagukilukikusemokedelig.pdfIn PDF document text
    • http://espokebar.com/uploads/files/dotol.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/73981635975.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4d439957---sifezugisaxiwariba.pdfIn PDF document text
    • http://drironcat.com/images/file/pekabebobipi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/30958170074.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/dokonopiruxu.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/xatovugedidi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74cf175de---mamabedox.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/24262233568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dua+to+protect+from+all+harmPDF 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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 10480 bytes
SHA-256: a525491686b04dab455d8cd9e40efdaef8136c1a2d900658c9a4e2790d5f7684
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 23028 bytes
SHA-256: 9196a7750830f801e6baa3752bebd985c32e55f6007e9fe911cc4f9f180981c8
font_02_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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