Malicious PDF — malware analysis report

Static analysis result for SHA-256 018e531925245a1f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 23:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49903516286fba4384d38c508a7e7e24 SHA-1: fc6a2e43f8c866924a777531fc12324c4e5de045 SHA-256: 018e531925245a1fe695eb2b4fa8f890221a1f74c81cb19bed16ade5e5ea2d36
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://seednseed.com/admin/fckfiles/file/vatuxugudesudelawavek.pdf In PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/mevufonaxuzopinunowegup.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vujupunawipaxejor.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8e7e4db1---renuradudeten.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/13022640546.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/gikum.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421b4316ffc---jabenegunoxelafojus.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/86214065376.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/23994808063.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/fumemogalasosas.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/34185129647.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/68340067278.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/62052727818.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/26725840605.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/zisom.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/13861266529.pdfIn PDF document text
    • http://movediary.com/userfiles/file/bufesosexi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c1a02c05d0db95d985b03db02f9c6e7b/21668032342.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/41243271362.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebefezusulafovozu.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/29550956261.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/bogude.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/kasaf.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/tiwurinavu.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/dupabuso.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/wamazisubovekikajetofoxu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/80653774580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+anyme+appPDF 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_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 10296 bytes
SHA-256: f6a8fe9ee24975e09c33a88cba352fde30a38be72cd7c9bef08accc190c64541
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 17972 bytes
SHA-256: 9d3ebf9707711a6702f8c257930f5b25a0f33d9e20652cc43391b377d545cddf

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