Malicious PDF — malware analysis report

Static analysis result for SHA-256 8234b02ebca57de2…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 02:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 675be6a3e1d271613de90fbc5584dd10 SHA-1: 64becf3e2c9befbb0e4d3dda0467d6cdab9379f5 SHA-256: 8234b02ebca57de23330951bf7164f00a8439ad678b55b9d0aaf4edbb986227c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of 'link farm' heuristics further supports the idea that the PDF is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=deepwater+horizon+movie+watch+online PDF link annotation
    • https://dichvumoinoi.com/ckfinder/userfiles/files/26988795135.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161509cc390fd2---47059223447.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e931ef19f4---mebixutinepukirivizonijox.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/72299488209.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/20432055543.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/10500840137.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/86825308322.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zetibujudoxunerotizoj.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/vimabelazo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479e7eb18c9---11046180445.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/timabo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/62046182006.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/botapabagefozilakagunej.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3elcvn75bhmv7q9fu7d8d5fthv/70943370455.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437948de517---wulodarepoxitejolomeke.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/roguzufuworod.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3f2eea6f2ba4cb704c0c7c8f6869be48/notikowolesizerovedekipa.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zuribubudimorij.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/28292255581.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/tobitisukikas.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a119c5740---41227756867.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/96243777439.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092703585539.pdfIn PDF document text
    • 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_off0000b2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 10684 bytes
SHA-256: d855be22ba1fd3754e7fe777168bafa5289e7c8a641778a24f467d477fd699f4
font_01_sfnt_off0000cb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 14512 bytes
SHA-256: 6ec0eaec6fefc0edd0c4736a0796c98efb33e1b3c0c17bb6fb4ed4aeac9968c4

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