Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc33e232f3d1c0…

MALICIOUS

PDF

78.9 KB Created: 2021-06-23 18:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9a675a853260fd823816140550531a6f SHA-1: a93a27e342368d6d27053c35fce27fd5f4847661 SHA-256: efdc33e232f3d1c01395a396894d33f834322a9dbbd53d46e0d5b96e3d9d1011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8l6jo49tpbi15kk4jkfc7797o6/82963854144.pdf In PDF document text
    • http://nessium.net/userfiles/file/54672577433.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089459c6c064---rubiriwisojuzedememoz.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7c2f6f1---47832001242.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/81ad1fe5e0a8785c7905c60b33051a78/73333108535.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/30127507326.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/26690234852.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c5daa061---9543283109.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be2f97d0d6---desobusivuloridivunugi.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/22553534715.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/vekekobok.pdfIn PDF document text
    • http://brukbet.com/user_images/file/71702671397.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a390f79550751ea77c1222dd8f7ce4a4/jijilifup.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f6ce4ab27c256a020a1cc6a1a425bfe9/77725904079.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5040e4945c---8731373923.pdfIn PDF document text
    • https://hirurgija.me//files/tuvifujuderek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=itext+7+print+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 4700 bytes
SHA-256: 52c268a8b853340ebe9a48d1fc9a757b28c9bfa2627864707cf52a9f0cbf2b1e
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 2920 bytes
SHA-256: 417de620c75229d5d84ec01c8bbf92d9c999c13b3c7bf3e2f8269730542c78c3
font_02_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 12064 bytes
SHA-256: 47f4b28a8076b9b1fd27c3a7f500666c6a2df320a147054034315030af6453a1
font_03_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 3380 bytes
SHA-256: b98b5c4ccd7c242e1eaf793fd64056512de386602a2a49281352696b887768f2