Malicious PDF — malware analysis report

Static analysis result for SHA-256 6affb755e9150e9a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 08:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ff36f0bd833f93ff2e7cbe38449ef98 SHA-1: 1c0f8718aba8f5bae16159be83e747ceda73a475 SHA-256: 6affb755e9150e9a3d9612808f766ee4243aa16a601c2d172ebe56d9447e3a7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://artecgroupservices.com/imagenes/file/18809686570.pdf In PDF document text
    • http://garagehayashi.com/js/upload/files/kiwigalanoporabuzaw.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/78554474594.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/tekel.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060ae0c45d8---lasam.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/29008930232.pdfIn PDF document text
    • http://euro-ex.com/41837126736.pdfIn PDF document text
    • https://stotex.rs/files/vagogolezuwatepodafasinox.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/6393512148.pdfIn PDF document text
    • http://venkateshservices.com/uploads/47437414849.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rerufubi.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/susopowimimajokinupisu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45510978a3---fivokolabevovagutojasod.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/wiromonisofedereb.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/pamitinala.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/71335267407.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/9360502241.pdfIn PDF document text
    • http://badgerhillfarm.uk/97434448312.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb686cedd90---sonogagazupojax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae7b7a49cb---90722233179.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/82672453485.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/bivabofufad.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/rujar.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/984c04aef75dcb4f6261ae2d70b44946/7486772630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=piano+covers+of+popular+songs+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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 14956 bytes
SHA-256: dc3037594363e4cf655ee44a47bd78018bd2e4cb0828199037eb40de62db2165
font_02_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10864 bytes
SHA-256: c752a68a3e3763293874b3cef9b56f0c4641e4efb95996fdc5fa5e33caa9a018

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