Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bffd6620abed3d3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 14:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 292d3d32f7cfd8b65e240bff392c89d1 SHA-1: 7561ee5a5460b30c7e25d479377fa99e0156c2eb SHA-256: 0bffd6620abed3d30c99b9402a6f082febed17df5b5b041ce19d511b8e99378d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://greenbiotech.vn/uploads/userfiles/file/buwonezeterabepowotuw.pdf In PDF document text
    • https://cailux.lu/userfiles/files/kowuxapogude.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/8767997658.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a27c94d8---popuwavilukorobojo.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xiturinevunapudowoda.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55924178609.pdfIn PDF document text
    • http://domainecomps.com/documents/files/nizusuporiwut.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607889daceb84---1004015497.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/36552197798.pdfIn PDF document text
    • http://npas.ru/pic/file/dabewepagiza.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160890d500bc3b---16651679114.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c1dc2bfa---karumasikonujajizifojami.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078621deaa4a---pexipibakoxala.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/reboxagakenodo.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/27984803569.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/9797264042.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec90cb7c2c67d0dc85d19b3a21228d3a/47626968199.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5dfmakuv3bru7t5feq3kbnqts1/61177074118.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9fdb1829838a80c8266495bdb5a1b9be/97206895465.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46754765485.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/3h9qjhfavu59js6iutsodb4qr1/65851613415.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9c717d4e---jodajunawariva.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/vuzanidazusudusodijop.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/vivevuwokanamoxufinijuwa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ea4f22ed364d41de7d5a2a08386dc39d/guvagafurixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kft+test+report+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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 10076 bytes
SHA-256: bc4781d601cbcd22068fe1d4d99930c328c31e7b3b1a3329039167be685e1092
font_02_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 15840 bytes
SHA-256: 78b4a0685da5f4520c05719878e8bf07fce1318fbe4d01e944ff4b1f1cb7c434