Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c19e7c03688564…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 14:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7b20bb0261e7c434fcd34f1745ae002 SHA-1: 3cef5237c3190831bd7aa0710121a14d2f553c5f SHA-256: d4c19e7c03688564e2ae0232dcbe6928d715fbcbb1c84135d826aec0ae43d846
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads, contributing to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ormansagszive.hu/upload/file/17870460762.pdf In PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/31109627648.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/91922075274.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/jumusuwokirekotelisako.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/bekuzajarotu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be19119183---62838934009.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/nuguzugoju.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/furopovelazoxekovura.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/35198850641.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917083640.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/fopesokomumusi.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901165509955186.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/65553012644.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/gezevosorowifu.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/luvenomudamuvakawo.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/waxukigog.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/zizupivatenaxi.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xozirusebipasamexibemuv.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/38647947733.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d2571b2d4bfca130f8f0967e0990c855/24117453885.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/79470534659.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346d4c59eef---nelel.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/6384723556.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lakitufokuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=keto+bodybuilding+diet+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_off0000b576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB576 15520 bytes
SHA-256: 10b78383435368da5d841067b4ae43da68ef2091c5d15da03cc10138ad32153a
font_01_sfnt_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 10588 bytes
SHA-256: 3518edac6e0640d8840937db91b1dc62ee1d42b76e5a27f45f8d9a1aca0f67b1
font_02_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1