Malicious PDF — malware analysis report

Static analysis result for SHA-256 342ed71a1f92b5e0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 05:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f6b8ac2646258e8d931505effb9949c7 SHA-1: 1f726a0457c53cba3878f5b92bb167676790fa7b SHA-256: 342ed71a1f92b5e017c141695632dbd5ce7cace4599915a11d8705315e1d3250
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://algarestofos.pnh.pt/js/ckfinder/userfiles/files/96896883101.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bo8lcpgf39csaqj0furm8773ri/52472956969.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vizajagorokasafu.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/dezonu.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/24816169464.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zalomonolapidovuwep.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/8419400533.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/1557008897.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/komavafagumuwa.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/u52875d0p9n0fi45le2opi5957/jedugaxipisedoxatalidigu.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/70462379394.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/34232375600.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/29191533803.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/kefefumep.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dab8017ab84869e79cc089508817bd3c/nikodekon.pdfIn PDF document text
    • https://ntc-container.com/upload/files/32349812391.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/71269964404.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/lixuj.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/188c1481c2999421904bbf749a76ca5b/jemamozabinifokalutonamen.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613104d577c93---naxim.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/30620122720.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137509aa2059---savepizamorozokigarixa.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902025156.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/bukakopoma.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/20963617944.pdfIn PDF document text
    • https://alkoplast.rs/files/31549852423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+fix+the+notification+bar+on+androidPDF 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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10676 bytes
SHA-256: ceafbf525915a1375c9510b106ce01cafc8b86c3cbf5957b57dfa4de57205d2c
font_01_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 19492 bytes
SHA-256: 9a1df8079051cb51876ded76f2e34b1794f61bf654a420bd14b26fcada278cfa