Malicious PDF — malware analysis report

Static analysis result for SHA-256 9153d00fa2fac574…

MALICIOUS

PDF

82.9 KB Created: 2021-08-29 10:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ccc5a38429a5c61f817cd6c7aa0b9184 SHA-1: 435e3e06cbb0d754df41295b9bd52ff8b0f3db59 SHA-256: 9153d00fa2fac574ef43e73800424a180394e59bd27daccaeb2eb62fb47d2010
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to host or distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elnativocoffee.com/silver/upload/files/5254594014.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c1769be6---67512486230.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jipisesamavip.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/26412165272.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/pulofakexetamutesifujitiw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7db2eecb---87732275857.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/wifik.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/433479097.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/53728628774.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a733cb251---88752834516.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vukufagejapawiren.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/makupevuzofinikofov.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/53439334570.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/82744780756.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdihpit2jhi8ijm8a42f7vgred/59585332968.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6g276its4n14coptsa14rdtgss/fenexokekop.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/53973863336.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eae96bc85dd7a02050cc712ad4e2547e/lulokivegeset.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/zodafujoruj.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22233299d---8741794269.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/xapuxu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xusafevobamuvuvexu.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/86702612350.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=oral+motor+speech+therapyPDF 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_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 17268 bytes
SHA-256: 990b561a3296be89d95b2e46ac66d2da06e9c8775cba383b901fd90b402b0869
font_01_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 10580 bytes
SHA-256: 508bb8fc750b51709a6246bc2ffe84eeb9f6209029b7321586a448cc8e115b5e