Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a928fb9e036907…

MALICIOUS

PDF

94.0 KB Created: 2021-08-09 20:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17d203030328eb34a8605f45d9b43156 SHA-1: cf59eebfcd71a1812c3ed943b5fc76cea9c5c533 SHA-256: b2a928fb9e036907875009c425870e5295035586639cfe8844cb28c839f04670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/03ec6f316349257c93d0bcfe6f5d11cd/lofudenedosewa.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/50jqmdg1jtij6nleec1eiq6bt1/57580811610.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d6be9029527---numewutomiwa.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/96296434724.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/25650108970.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n5fm4g45voffut184ecc2ckct4/70616823708.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/vajinazotexatowanikesa.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/rikokezuvofufofus.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/84296558939.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/xipejiwavaguwanol.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/dfaea7364c99b16679442f042f3df4b8/57591898254.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709e7864a45---belojokonujanakedibaka.pdfIn PDF document text
    • http://halmar.info/userfiles/file/46487818690.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/r63mglotbri8g8i8rhhlvg32u8/fenutuvodaxim.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/40028106361.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079963289ba5---73579480265.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/28851796985.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vinate.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/034b176057150c3cc7f4eec864f18791/99554611602.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7a3a5eae161037e1e4e5e9914649a3a0/wakozamujoxili.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/karetevazis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+3+categories+of+fire+evacuationPDF 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_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 16932 bytes
SHA-256: 3118ca16d0d48b5644f967fd137759663b0a877792df3e80a3e44a548b1dcd52
font_02_sfnt_off000150c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C9 10900 bytes
SHA-256: f062c674f45c51c5c45e724e34516b7a7eff928e786b7cce10041edcd1495ab9

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