Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8abecca53b25186…

MALICIOUS

PDF

88.7 KB Created: 2021-08-18 00:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 75eac8de0e67588097aa9f12806dfe9a SHA-1: 3db1ce1fcb28ad673604367be81b807fa2b3df2c SHA-256: c8abecca53b2518677871adaa97cbc8d154ebaecbb479059e0c31c1d98be90ef
164 Risk Score

Malware Insights

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

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc736f74d2321a0dd0155e3da6ecaeb1/54975978480.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/7743284980.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/mupudelefupowabop.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zorimakowidanogodi.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/40723878403.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/55762716392.pdfIn PDF document text
    • http://winso.tw/userfiles/file/64166253449.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/65402774552.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizexodonexaxawegod.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bda37ed82fb---nugawa.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/xoveseropeli.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/gawupomesofap.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57cb5157---71094949090.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jevugetugexawizeral.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/48538703396.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/vetiwodemexugadewozal.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/4217996121.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753bac11d9e---61430731406.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02220296fb---jasadaviwinujero.pdfIn PDF document text
    • http://orem.mn/uploads/files/18244849111.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/zevutakixesagozalage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+go+spoofing+pc+downloadPDF 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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 17548 bytes
SHA-256: 8bfd452225fb2b0ccc907688ac5492ef84eecaf5bffe495e700655011759c4da
font_01_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13995 10944 bytes
SHA-256: 24d3e5442c5c6d30dce2ac9b12ebe4bc6ccb035befd838cc72c1a34c0984117e

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