Malicious PDF — malware analysis report

Static analysis result for SHA-256 617d3f647e134c39…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 18:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b57f4e0d7b8bbfce1dad27cb08ae6883 SHA-1: 0e4aac5707418388c25dfe78eb4cab911c073201 SHA-256: 617d3f647e134c399f2d22ac3fd6a17835e7b845105d43b73ccb853785efb691
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which could host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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 https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161374452a1ee4---34401178111.pdf In PDF document text
    • http://ctapigroup3.com/contents/files/sezuwuvopudoxeribamivaf.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/46840320084.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/11924218276.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/42066775274.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/pabiw.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/wejimexaramujigagudo.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zixaluwegisapumokixizuwas.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/25231596758.pdfIn PDF document text
    • http://veitali.com/upload/files/54121583540.pdfIn PDF document text
    • http://castel.lu/userfiles/files/zibufeguxef.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/22899649858.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s1mfnp76chscokc5o48joslu02/kubifegetixowikefawat.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614010a5a0deb---memojereliguxiwesixopizut.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141121289c02---56127000464.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/gafunot.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/namijamusogex.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/gorosere.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/83736079380.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pokomadunefedu.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/fotumojetagixikol.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/81612843205.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/30005437127.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/97122878077.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/67310467404.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/wupagutidap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=a+positive+word+that+starts+with+the+letter+kPDF 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_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 17384 bytes
SHA-256: 2f4c62280411d5b86f60bf88a8418a509463cc8231dcc1530834b3b57a5f2c2d
font_01_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 10608 bytes
SHA-256: 91e4bdd5340593bbda3d246510fe44c56f0ca272bd168028e6abe19c1b95267b

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