Malicious PDF — malware analysis report

Static analysis result for SHA-256 01210beb5e278a77…

MALICIOUS

PDF

159.3 KB Created: 2021-09-04 10:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 383a00feb199ae69121da3a7f0543a86 SHA-1: 57724955db04425a7bd6c82d8c565e8ff55a46a7 SHA-256: 01210beb5e278a77ce7b2aa16b77afd63d59dad09f1407a7d0ada80eacaf5f0f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and heuristic firings suggest the PDF is designed to lead users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dutipodubidogabebu.pdf In PDF document text
    • http://www.kotolantopeni.cz/files/1602151605.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/66825055671.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/75784778777.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5835336b---bozugosobuwexesagigumidis.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210902_40A73549C964FF80.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/sikibilizagoxufuk.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/rureguximagirix.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/31749996944.pdfIn PDF document text
    • https://olterus.org/contents//files/82957951866.pdfIn PDF document text
    • http://davcpundri.com/css/file/44236999475.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/ririxakutulibosimivagi.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/renamitupiw.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eea184b04---88116567168.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7bfba2c66---33165920335.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/46470273579.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f5eaed6c4a260e93c0ee238e3c774c55/30910395135.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/615d6bcaa8ace7c4d77a7a3d6bb3244e/vagezakuzoxodobodoxep.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9a0d36a8da6fea9c625b411000c080e6/54504145263.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3c2736ce0765b6d1e95de437273e890/zorapibinenogiduva.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8233e1fc---xagabetejejedal.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/11d6e5b6e89d65b7b4abd7a75785a5ea/nizijemepisupedoz.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/71255138957.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/55135932630.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/74k8cbjj066e9ogpcd56r4d44t/12237553258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=great+expectations+pdf+analysisPDF 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_off00020878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20878 20600 bytes
SHA-256: 49bcf2a40309fe1a5e6f433611496002711926a3410c38b4e5fe65d89dd1eb08
font_01_sfnt_off00023ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25604 10868 bytes
SHA-256: cc71d48e39ee6cc834629982b2c29afb19f2438cf11a1e481814f802fdad3f88

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