Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f47c00baa62d39d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 21:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 143c24d8593f7b6362d7e4fa001fb109 SHA-1: 8df8b308aba5630b8bfef0e70f7f8793b72005d1 SHA-256: 4f47c00baa62d39de9d68e1bae3698d42e7f6b0394dc8ee51b8de3f18759e768
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://wakarusavalley.org/userfiles/file/54311108809.pdf In PDF document text
    • http://mintaialuminum.com/d/files/65185112475.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/jijeberuxuriletizeji.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4736ed9d6---jurugegapuduxutonevovovu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105281607.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160940ef444943---62421321478.pdfIn PDF document text
    • http://foodchemsino.com/d/files/34093408126.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fozelotiduxe.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/gotukovevebapupa.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/5763791215.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/67fa5c0df030d840ed33101679802692/rajuxegalubevugonolevifom.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/62391796719.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/55198081615.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b041a60eaad---bemuvexonoxoxi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072594a9bab2---15346385090.pdfIn PDF document text
    • http://wernitznigg.at/files/50703576867.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/rubajiziwufinejox.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210902_025233.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeda6809c1---vavekepajutufupelaza.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/wexerifigewivebovulavele.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c09d7410bda---81733373261.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/329d09cd0d39be253ac32a8590296182/17325549851.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/ronufizuza.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/gelutesexuzigeraxuzu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/d9886e9n19hb31rnnih8pspce3/sokolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ontological+coaching+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_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 10524 bytes
SHA-256: 4ccf0b4b129c223dd5e167de040dc02bff45397bf1c4eefac3fdb1bae0a0eeac
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 17888 bytes
SHA-256: 7c3c956bc45a879c493cfd9c12ce5e5996a44ceff0053a31c10fa85ece50abf9
font_02_sfnt_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1