Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f816f4c449a479…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 05:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 710c2bdda9855bc0147e54e8967540b8 SHA-1: 8ee4fa1e9e297b2dab67986129248a6300357610 SHA-256: 16f816f4c449a479648f1e3ecc2ba07d7c75538bb1c731bb0fa3787f76b4cbe2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, indicating a distribution or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to lure users to external malicious content. No scripts were extracted, but the overall structure points to a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://hglobaltourb2c.com/FileData/ckfinder/files/20210609_5CBABB0955D65C22.pdf In PDF document text
    • http://sdds.be/userfiles/file/jubum.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fd3ea73e20e2944c9a1c42850eb43702/48760971376.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/tozidurusixut.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9d8bbcdad94a1cafd515ade78c96501e/vupakolusaluxat.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a077adae09---1744727753.pdfIn PDF document text
    • http://nietegeleuve.nl/cms/files/tudivolakerimipefawedogu.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/20692802726.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4cf025afb---49036048758.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e173d646ea3e42ae056ddb869d305087/vasebifanewipiwiv.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/o4gpu9ll4r4qpnd8sjesd6tdu6/gebivoju.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/88ddc73d6e98bdd4089989906dc4052c/96768247951.pdfIn PDF document text
    • https://susta.vn/userfiles/file/widevikin.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/nkjbcfuh46937euec1l25gepa1/gosidasurosojebidulu.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/tinisuxule.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tr8mnsmn1us5ejtf9ls7ccobbm/wupukuxide.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a467ea69---71964489185.pdfIn PDF document text
    • http://movediary.com/userfiles/file/59812891928.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210628163042439.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65ac7168b---retitefixafopowafila.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/wedinesamubiwujojir.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609235860f32a---misixutevokezinorusirizuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+the+aftermath+movie+online+freePDF 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_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 17852 bytes
SHA-256: bb8cd201191df77e3c618366f099ba60b61191e6c0d2576f8b23711a00eda1a9
font_01_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 10492 bytes
SHA-256: 5e85b870489e4492a248382ae9cf26484daf2302a5fc4f45a8ad52e23532f368
font_02_sfnt_off000147c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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