Malicious PDF — malware analysis report

Static analysis result for SHA-256 155799d2e6dc18c5…

MALICIOUS

PDF

87.0 KB Created: 2021-08-13 01:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: d39917ef4a376ae3e9d0ef1dd55856c0 SHA-1: 19a10aae6405919e1e0b40587f99cf964f8f0daf SHA-256: 155799d2e6dc18c5c1849195687d4dbb6147891399df2492e396e94349a04231
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://wastran.ru/uplcv?utm_term=how+to+change+background+in+photoshop+elements+13 PDF link annotation
    • http://alimentosldm.com/userfiles/file/betodipamefelose.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/ridemisif.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/64688343411.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/66518553334.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/godabodapiriti.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca5616b7341fc5c39adc5b31b0a12426/32685590567.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3272b735---lenaregabikevavifugas.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/lobun.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/daede77ff804a013942c3674d8e9204b/25234963522.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/a9r2046meiajiukhcma1l8j0c3/divutitufanalutesevikite.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fe21b4b651fb44706ce613c3b5f978a/83162019871.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/35514619093.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609343def066e---3877881725.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/verosomadesogunufuvil.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/84866008269.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104359562ba4---pogepis.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/57520062977.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/gagijefotibolut.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/lebegufogibanej.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adebb71b08b---vujupurusijefigabumada.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/11699401939.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd66faaa438---73822100385.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zogibu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nefowixawevekubusakuxo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/gebaku.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_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 11596 bytes
SHA-256: 444a164fae2715891c782ba901b72c7badecaa9d0445506df77da78bf19cc69e
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 16864 bytes
SHA-256: 3443584aa2d4f616088ab7f8d4715f05c04f7626ad480a9c07679f1ee1d1f7b8
font_02_sfnt_off000135bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1