Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4c19dc0cdeefcf…

MALICIOUS

PDF

110.7 KB Created: 2021-09-04 21:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 594ea520dc714973f13c10cbb518f1cf SHA-1: d2c9bbeaea02c52f394da70220302382a7ba02a4 SHA-256: cd4c19dc0cdeefcf1606fb731a96a187842dea5e6598c08064b0bf94cdb78378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites that appear to be compromised CMS uploads, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially harmful external sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaduzonez.pdf In PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608328a9b5317---goxaxexesekurowiz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c31925c12---11925547747.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/puvixi.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/55693303126.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/86141222313.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6284b82bdf---pifiwulazosewabodege.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/67124864535.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/14602958045.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e9a73b068b6a7a0ab7b41cebb2ca35a2/zipusawagoparejo.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gizov.pdfIn PDF document text
    • https://advik.net/userfiles/file/75964912082.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb812216---21699250526.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/deguramuxibokujebiriz.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/72458877046.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/gosidi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/50715759915.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e74ff405f938a98a732376c719bfef0f/lobakivov.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/91594556604.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/29472229365.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/25710791188.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/45564546565.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bepubazobefexavu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qfcfh5heecv2u80o72plh6rt92/84132042138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=educational+planning+and+management+notes+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_off00014879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14879 10948 bytes
SHA-256: 98b2caa015c146f0f8d6ad00248a8e4703d2717451d09546a74b300475fadc4c
font_01_sfnt_off0001619a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619A 19880 bytes
SHA-256: 8d509e0440a13b0b10c2b8e663be4f0ddf3bfab40d0828e61667dd058b93b8f6
font_02_sfnt_off000194ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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