Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5d58b074056ab5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 21:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2560d20d3d40b7f158298bc4daecae2 SHA-1: 928b9f326fde5bcc3521e8a0baede284ba3963a1 SHA-256: 9b5d58b074056ab5268a9e589e3547b904981b8aed4428477609e2661cfc2f53
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://galaxy-training.com/userfiles/file/7872408249.pdf In PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/99062921553.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/7678167973.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/nuvofuvajudikeluzepavufi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/69b24707dce1ad5527a19b49096d4a6b/90878620942.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/17769692948.pdfIn PDF document text
    • http://ukrfirework.com/images/file/gemutu.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/pirekuwoxaboxuwu.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/40968934114.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/78646190282.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/35004278870.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/67237831358.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bijuporenisojaruma.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/85860939996.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308197c9801---90312718656.pdfIn PDF document text
    • https://flomogroup.com/upload/files/8975779877.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130982eef4b1---6085604242.pdfIn PDF document text
    • http://prota.ru/upload/files/tubub.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/jinakekoxujolino.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630540697.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/94712511387.pdfIn PDF document text
    • http://freeski.hu/freeski/file/38364282137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=first+man+stream+freePDF 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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 18728 bytes
SHA-256: c81738aebb5f1f0120f98bf8df6595c8c5955ded5932f707026a9d1c0639078f
font_01_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 10188 bytes
SHA-256: 3a25a45c4470cd24737a2f954ad3840a6c4fd7155dc4346233d7ba09cc807818
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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