Malicious PDF — malware analysis report

Static analysis result for SHA-256 120573bb2a28e1b1…

MALICIOUS

PDF

101.1 KB Created: 2021-08-16 12:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3374d3d1689a8e61a412428438e79f21 SHA-1: 72cf0baaaeb3891db7dc72467cb4e224591abe1f SHA-256: 120573bb2a28e1b1bcf496880bd9ebc410ff6ef0892d10557f8be973f2284bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f0c8ce10a75067a900f5114ca242656f/tajiteliwemesuwibaruj.pdf In PDF document text
    • https://shiphangnhanh.net/uploads/image/files/58526896990.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3468ffb8---jumisowevinadezeburof.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f87986ad0dbd268bab79a5b2b19657ab/bigijisopu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/38723167216.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rs0svmumkm6gsa5u2qpjb9j6k0/68600760055.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/siritibamaboki.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16095c431b6751---lejeguxedifeganobosepesir.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/miluzo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f6ff32e8---susafoxutobowajes.pdfIn PDF document text
    • https://anakmeong.com/contents//files/lipiliroki.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6cc94ca5---mazoxabagigoxune.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6435790a7d5c41352d27985028c83821/tibebubinekuzatur.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/sodumawixirukiteg.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/durowikusive.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c418039c173---gemurasumokegurezefe.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210708040359.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/50599026673.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c5ea78726---77307285299.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5b715d8f---jefesegegipegodozed.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c5419362b---fijur.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wonojujomuxitov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=handbook+of+informatics+for+nurses+%26+healthcare+professionals+ebookPDF 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_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 17432 bytes
SHA-256: 8d591c8e62885bf5d3c9eb59641fd57101eba90a9cdd99ed36d6f81427f29813
font_01_sfnt_off0001549e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549E 10916 bytes
SHA-256: e7b1d4b1da39bf04fa4c6652dc21155f65f9d9ef908a46897b7cc0c0b761e012
font_02_sfnt_off00016dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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