Malicious PDF — malware analysis report

Static analysis result for SHA-256 42397e3a129784ac…

MALICIOUS

PDF

89.5 KB Created: 2021-09-11 10:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0652cfd1f2617d29be8a771f029c6a44 SHA-1: ca6151274e89e096f16905e4761c396f42c8b12c SHA-256: 42397e3a129784ac9285ec1a03c7ef913f18f624b530aea18a43f330e386da09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of a link to a compromised WordPress upload storage further indicates malicious intent, likely to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://tecksco.com/upload/files/30769268236.pdf In PDF document text
    • http://stylowa-pss.pl/userfiles/file/linupeginirenusagiz.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/19570302779.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/61320026845.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/1677072574.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/99167725403.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/53124217983.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613002c05132c---22291355438.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rujuzelejebosogal.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/14477486493.pdfIn PDF document text
    • http://www.pvvc.cz/files/42294627364.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ata4nvk6vd3nol4d5h5uej11d0/kuwuvibawepenodu.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/jupoditubeladebebipeji.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/70060676652.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/81236911848.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5fe6c2a0---dizabunipusadomuweka.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/ritenoketi.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/kovakitupapefofe.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/batemepukedomumef.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/dopiwumotan.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/57937834242.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/ginidolaloleboriwen.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137293916cf8---mekegenafaxasisifad.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/59612017829.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/66542323177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=king+root+app+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10164 bytes
SHA-256: ee307b7c86e6389ad78972c2e7522c1e21664cac4f16ccab65d3d230ee559b3d
font_02_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 16256 bytes
SHA-256: 4cf27f6a2730840dabb2217601ed1dd6cdc89e20c7f81f6433d4281ab604e9fd
font_03_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 24804 bytes
SHA-256: a2d61c21855818510862ee51ed844dd3dc2c5b56bcb26f047dfee4498ef71785

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