Malicious PDF — malware analysis report

Static analysis result for SHA-256 0333a52ba5f7c35d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 05:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8761d064d52b287c8167e911f2f8b54 SHA-1: ab5e07770a4ec3866955120d81c6701cea1ef870 SHA-256: 0333a52ba5f7c35d9bffd0c575890ebc5ade8023ec25e0ca806dcf72696db48a
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 pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external URIs and the overall structure indicate an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aihyang.com/userfiles/file/bolemulumazaritukabugo.pdf In PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/9193890103.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/pumofozober.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16d824577---6199931000.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/79578477680.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/53862354526.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/d2m77on0lggukoanv7gu0lctfb/repivemakef.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/malezibop.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e7eb122ee---lopija.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/kamino.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pepaxikoduda.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3bb9c12117eea2ffac06796d7a1522d3/37749236440.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/divelebutakubufodupe.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/71281652786.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/9315137170.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adc070a83f8---jisaxefakifowupevaju.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rsq4dtru3j02vmorenjct8dej9/xagobijufimamowiborowava.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5aa2ebf94---pikilisazexavoku.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210721072752178.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/fojozexap.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef9a84703---67913437926.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/95200423784.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/rusil.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e01192f6---37345120836.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/31490097864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=animalia+kingdom+classification+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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 10804 bytes
SHA-256: 8647bf529b974de35ad7b03d2fed59f67b281bc07e0429bd9b77ddfa26f3a229
font_02_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 20284 bytes
SHA-256: a2ba96ed79b30401f9c8eaa0f7a934da8b36ddbf51f28bb89074b5971eeab4e3