Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b14e3433e8ced7…

MALICIOUS

PDF

95.1 KB Created: 2021-09-05 04:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95b23d67db28e280a24925d31387f1e7 SHA-1: 15ddceb5c9180ae4d77cb590080370d73036699b SHA-256: 76b14e3433e8ced7793b7bd94b93e611563120b3c1fbe27062fa771ff1fc6593
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vanhacollection.com/images/files/pokoxatuxokavufojewasedu.pdf In PDF document text
    • http://abwrva.com/uploads/files/salivoxorudixetago.pdfIn PDF document text
    • http://firegallery.ru/img/upload/62782538342.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/jomomo.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e07790eeb3cebab60adac97b4ec9b5e7/52479021013.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/gemegaxamepuxumog.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1b7e92984cd79caebc48096e70a6a14a/73050546572.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202188175118.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/76028198870.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161263f3b2c7f3---90433264654.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/2526659326.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/36673147785.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/nisedo.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/40258510309.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///petagesumasaxawolep.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/32707650517.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/sezefimipoxafupaj.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/vitukuni.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8158d527c---70221453704.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/23811196291.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/94085986190.pdfIn PDF document text
    • http://nprofit.hk/userfiles/lewafete.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16084e733704eb---negesivizedekarinivoj.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/87967298297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=traveller+intermediate+b1+teacher%27s+book+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_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 21108 bytes
SHA-256: 4ec9c66d51aebfca75dc45f8fc24267497e9c9b43fdd804982c6c343db15cf6f
font_02_sfnt_off0001544a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544A 11232 bytes
SHA-256: 623dacc53b581e56d540c8577bebe98abf2644530d57d3d2f21f27c499217093

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