Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46374d7615c0705…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 00:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e469b0761a1181836cd1f0942d5dcb27 SHA-1: deda000aa127f91900f8b7aa220b153ab9cd76c9 SHA-256: a46374d7615c07050d3fca707bcf2b94024e55edef30d6a8763eab5a31200cff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the presence of PDF_URI and the overall structure strongly suggest an attempt to redirect users to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4rb93g1uom8d1spvokgghdfaf7/vabel.pdf In PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/32268935826.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e24fc41c2---gerawijasopum.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4fbf26e8c06685e16beea85302fc3f53/60272928477.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ba5a55aa7b43efd4dc531f97dc5af5b/33700709652.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/6009172244.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/sozobatulixabarotid.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/15468817782.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/xifuk.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b942c5c38---89064511426.pdfIn PDF document text
    • http://lyshiying.com/d/files/32919708033.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5e831bbbd95f010a5cfdfb4d23c57f58/6503005323.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ffnf6v2nhpmf6ajirh5afhg74n/75240197062.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wupuwubobumotegififalazas.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/binorosopu.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/kenibituka.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jeximu.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/ludofokan.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3b6ab10e7f4b67c55e6e4687d742b11d/71812707743.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/levobikurajenowelag.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vkgb49plmu6e973elpkgu9bq69/13104220862.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3b9362d3---tesavazovuxi.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/wesajuxulavazixizumex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=coronary+artery+disease+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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 17680 bytes
SHA-256: c12485e41a5e9f578410c9446574ffca03ce9e82d2c02ed1f17b22414ea0083d
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 10588 bytes
SHA-256: 8c53794da34ff2e0d5d68f7f2920d603c1d78428902b406351e9f2f81a0c5976
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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