Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb5962ed252bbc4…

MALICIOUS

PDF

100.2 KB Created: 2021-09-06 03:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dd8d5d02ae7f0e44fac67fea6ead64d SHA-1: 24f42d5129d514454a0fd9d65a64f4b934de4be9 SHA-256: 3fb5962ed252bbc47d409d3363698a1d401e43db3b80d3c166c9cc2bd6e89d00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress sites. The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms, suggesting an attempt to distribute or host malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3c00cc0474b03fb99658e0d18f5ff4d/jutabuzereroxukoriwuxuwa.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/negilipirimijazimawek.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3cad320e5---nowigowuwanufepu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cec03b94c39---15656580766.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098addcb1215---85534456780.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/84977548844.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53c608ab2---boropolujimi.pdfIn PDF document text
    • http://ccsl.asia/files/pogemokuvinu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/70881436185.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa80f05c5---ritexase.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lezev.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/64glh2613b53rojp2d96sjq9i5/725514362.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/12155247117.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/bonilezajozarij.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/214e7708961ea7c0003d8563b08b925b/migijuguxiti.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdec256b32---laruru.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c18a4d8c58f4e176a568525f40ffefbd/jabomi.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/savalimaniwos.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3a19d8c41f9b9517daf3d1d7f976428f/79375124953.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/39390295155.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210702_B595C556AD3622BA.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612db6752651f---tafoverudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=comboios+cp+lisboa+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_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 10520 bytes
SHA-256: 8beb0501c097452e4b232bb1234ace7ad1f92bd5a6e9318a343f7e71aed173ee
font_02_sfnt_off00014d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D89 20136 bytes
SHA-256: 8054cae29c26c936ae1c74ae90c663e757379a02a0d5e6ff556c381fa032db26

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