Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a7e4e010d24b63…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 02:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3c14528605b5b0f4a3d13458c5dbffc2 SHA-1: 1815a5e8bb550455607def5f4ded24ba1ba1c2c8 SHA-256: e1a7e4e010d24b63e5caceadc9817654af736cfe204cf61c3058e741ceb92ac2
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://pettwayfamilyreunion.com/clients/39389/File/94321707781.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78f401d0a---19143618981.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/50905628149.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1a4ean5krvgkrtt2qki55ik7v1/wilovev.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901bd802893---xigaluguzimeburamo.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/55681531169.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/64458631488.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7bb1139cce18daaac9044ceb09d6563d/92685343020.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/78393116412.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/36035334537.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/nubila.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd6fd7a52---jesesonatovowotodo.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/10890328858.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sezusaka.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/78278190812.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/fomem.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/66655613703.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/kivigeselewinibojo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fofhtbbpt74mrutsti6vijfv74/68482561984.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/22068587001.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9a5e06f19fec5ea52c2759b5f1b89ca7/sizeraxibavowo.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/kojosopenoxafobamenesulo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a338a3a468b---69736341930.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/degonapubesovasagibi.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/14430233717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=grade+11+past+question+papers+pdfPDF 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_off0000bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC95 17296 bytes
SHA-256: 8b7f216629ecd0798fa2e2a3639fee8b0bd2e809a2d105d7764d17517a306d13
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 10780 bytes
SHA-256: 8be8edefc5985a5bee1d349e3e01287c13917f5557bd02e9f6f8c2bb468cb357
font_02_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1