Malicious PDF — malware analysis report

Static analysis result for SHA-256 579794d0f37e1599…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 10:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 795e5f98d4d763880a02987e4e37e027 SHA-1: 0de0d76cbe0e2f7f5742473ccb17ac6e1e435b22 SHA-256: 579794d0f37e159994fa728e7bc82ef809dc229434ce9eeadc6a677351a52c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://aksusu.com/upload/files/47146966693.pdf In PDF document text
    • https://mimpiindahsatu.com/contents/files/sesaf.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ff6f714a89e43e5a838b08c2c3b5804c/77847419748.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab344cf189---91267873185.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lopumivajekawufuxozofulij.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139d8ad676---vezimoluposemupineweb.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161425e29ca075---35046998428.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/rugilogepamor.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/77442849068.pdfIn PDF document text
    • http://cecev.com/stockages/files/potuxeda.pdfIn PDF document text
    • http://intertribo.sk/files/22812126763.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/sonegemudenojaduginot.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/91814582448.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305af9735e3---kapalerelijojos.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/bazuso.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d2150300---70313862133.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/17814883271.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9e72796d---pewizijoze.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/dakukaxu.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/nilotozalitukod.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/45393192277.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/dodevevijutugugudofifow.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/46177452458.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/h2j0kl4jdlctthk3u27mbq430a/delotetumobemetoz.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/joniboxur.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/16214711328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=find+chord+length+from+arc+lengthPDF 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_off0000b7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EC 16216 bytes
SHA-256: 894cb76a067c999a0221074dc0a00330e775deb144108b7a674f625436c18829
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 10732 bytes
SHA-256: bb6c8bb3747b221d363ccb6fcd1558336147900b4b4029d2bd8f71ad4cdbd03d