Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9db0d2212886e67…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 23:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31a77c1224e59730d6331d71433e4015 SHA-1: f827fc246f46c2c86661a9fbbd54d5081c56ad8a SHA-256: f9db0d2212886e67e9044f2c324f8cf3d9995ffda03e1f47fd55c0ab6783c61e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure itself points towards exploitation for client execution, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a73efd5b6240d307803df4a4743b463f/sabefawusonenudez.pdf In PDF document text
    • http://wu-pao.com/upfiles/editor/files/41700447236.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/xusuzedobimarudu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b4fea85384a5aed66b73842d1d92f65f/89968984173.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7b7792f0152d868f102c7c906238c9e8/70159773088.pdfIn PDF document text
    • https://jss-moms.si/upload/File/joxajomaditatodidapirelu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6fbd7b55104f03b18d5cf5798229f276/roniwovinifupenojosoradup.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/846d55ec657c651faa41884043a7d8ba/60252909426.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6680b1cc7---gepadobegolobatux.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/budejupevifepe.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/13377229335.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/gosejedoxudenimijabu.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/wimixetatokulanupabalo.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/92348378073.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/tenivedemalesaxiwov.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb594ba10c---44406265903.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/31436715752.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/zejupafokofosim.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e60a2e232---95766776654.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/mimawupirewabeb.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rimuz.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/waxewu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0d38860b---10995601701.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/5cd3875d861f6e29272490400b60012d/pejudolo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/95e6104ka3ep36htet1lvkdpf2/61668641933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gharelu+hinsa+adhiniyam+2005+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_off0000c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 20468 bytes
SHA-256: 66cce08aa4444a5ee2292108bdb32c2ab6d9af0f00c6b35b186f402af45feace
font_01_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 11176 bytes
SHA-256: a7a6d3c67d22dc3505ade8b2b1a3732332091f6a6c1fc3ee79711d19121bd3bf
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.