Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa0a65ff3995d78…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 17:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a3e48249a5966301bfe969b528d7a18 SHA-1: 72abf32908a9b747e2d60877885b61c09df01fdd SHA-256: 9aa0a65ff3995d782d17e3e5af0f33b3bc6f9db0824a069b0f183a9c46eed9da
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g3u76svfptvuiekf5ii9pqfql2/27157610109.pdf In PDF document text
    • http://leeandrewdavison.com/download/55985696430.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/gazujaj.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/78236766066.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/33370748371.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/65917057693.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/40312520010.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/47427270036.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/labuduxosed.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/fafunegozipukexozete.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/68048801514.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/merogibif.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f37beb87---59217392960.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/buwiguxosuk.pdfIn PDF document text
    • https://stvorki.ru/files/file/dofiwe.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/78866011318.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161341cb441789---26331833480.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/dijafipawut.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/jusanibakunoti.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/burubiwidunufusija.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/zinixojukojukujogej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=street+fighter+1+download+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/xobov.pdfIn PDF document text
    • 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_off0000ad6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 10676 bytes
SHA-256: 9ff209aaa2bf47242dfd4a9821089b8490e9a95c69432e9a47145c7936913abd
font_02_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16412 bytes
SHA-256: af25bd7a4d0f8d0a3a712709b687a1ac6b9ef26483fdc34d797a22771ff6f50d