Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41053d21d40b099…

MALICIOUS

PDF

78.2 KB Created: 2021-08-26 08:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 493d65048bb44ab0e9f00c1620e15023 SHA-1: d4eea50a2d3a227ed58a4259faedd5fd1d1edb2a SHA-256: b41053d21d40b0993cb3acf710f491d4f474b8b1fb63e27786e0d8d738548ee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple external URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate malicious content, with the primary function appearing to be redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/77086741560a8e188ee2b0.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/d84025c415b30730e756627cd3c52e95/74317839691.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/juvub.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/82444049018.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/tevezolu.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/93442177624.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xopikikumodorixosepu.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/18197131306.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2dbed47d8---48554845496.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/eed5816eb0ebb01e3ecb52f7d965147d/xojonumafepujufugigekoni.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/zavobifomokatabiropemewe.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/dokal.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/ba3a62c1be51019a0cea7dbbd0f2aa8c/14257301108.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161101a5d28015---55099682.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/evj2497cunv8aj6isk03iqair2/66878156522.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/jagazipatipa.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/wamanimubopuje.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/monuzodarozo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050805295896780.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f4f2cad---44897490406.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6fc1rnssl6ncvj5f8hiq7d3elf/4211651879.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/357d366a5acad83fa1de448a3f18d400/zelowi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/634b2fe6f6c6778e3a5ec174582632fa/sofegogawibelexuxalazi.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/radisiwinojinapeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=missin+you+like+crazyPDF 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_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 16680 bytes
SHA-256: bb6997e4208e02a52dc59ff6c874a0fed18b1990519014942a731e713d374f0e
font_01_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 10484 bytes
SHA-256: 6d0267254bc8764798d25928e4696eebf4d476ba8f51849f3781583105feb1b6