Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cd9d84a019966a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 10:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d88583a6af1a544e7fa984fd442fc01 SHA-1: 56134b62db793dc10d2d2bae7c12b7527319407a SHA-256: 29cd9d84a019966a197f97d7ee17b8926fd9eb58e33c861030ecd0ce7d33abbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=interpersonal+relationships+professional+communication+skills+for+nurses+free+pdf PDF link annotation
    • https://zlataraburmevuckovic.com//files/dajerizixagixuwezoxobala.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d6cfad06c6c11aba265702792ffab2bd/tapolaj.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210604_F51B9D72B385CC4B.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161284919f083f---wumazesorapanenarajuk.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/msp0gsd2vsrjv08tush29626v3/1220294930.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8622m9ea6bepftitmplpatpmu7/83704529119.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c48eb757215---24770791731.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/42637496529.pdfIn PDF document text
    • https://jobtiara.com/files/files/21967754174.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/64484449703.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/23969168471.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/wobazepuxurebowaw.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/pojus.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4fdb1c5f---31802745945.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/7148952034.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079530fc1e9f---54952456599.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/u6je77e0euqr0sf9neh6ob9vkc/14285532034.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/5954238983.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a41d4dac---kejil.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8af92d68c789ea0dfe3f66b9326d8357/sonikixa.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5eb846be---puxewaridob.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c9nou1a3jkrj80mn1bvr72qe37/86184731745.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mirupusuvovevedabi.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7757b930a231f62e2ad80b658addf94/34584477122.pdfIn PDF document text
    • 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 11028 bytes
SHA-256: 0a8fe1de63b15dba073c7238b0ac68cb8ebecfd5911f58461a3cf8ad00fdc4c1
font_01_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 16892 bytes
SHA-256: 9de9a2c79cfad76b2d3e185f6679423ca3d169a45dc5d5c5a1c6dea158969dec
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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