Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3592526b97c9515…

MALICIOUS

PDF

93.3 KB Created: 2021-09-03 22:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 202f3f3875046a89cca6945e6a583183 SHA-1: 978c305d4de0d867d25a682a2e4a4367b585ceb8 SHA-256: b3592526b97c9515460573ce92f711eab58cab0f8063659ef59e46fbe7015bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics, likely leveraging a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://medvor.ru/uplcv?utm_term=lorenzo%27s+oil+video+worksheet+answers PDF link annotation
    • https://tiguan-wiki.ru/file/9330113239.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6072636433e10801792facb9e496c628/82229769150.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/depas.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/69935536784.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca9834f0e---lebuwa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e4877a3d---pazuwuregixajirawira.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc04079e8cb2d2d982038ef1e2303608/mukaguwono.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/medutewo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93f0ea59a---zevuvuwe.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1670de60---2654544096.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rum66fmmn58p6h5c878f86ogqm/96187069004.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/54927699401.pdfIn PDF document text
    • http://blueyee.com/upload/file/080225053436.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/0uq585qb24un8t3r4f15a806tt/fogaveja.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0afc3b86e---befisifebukoliva.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/t7lt2v99nhkiecin55htk8p1dq/wenukezikugediko.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/36062720760.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/sifolilixuluruzuvo.pdfIn PDF document text
    • http://unsersohn.com/images/file/34222827962.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/81854383306.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c206f4b16d0a38f94cea32d9e3d85a78/10230104470.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/durirolulawekitega.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c63df176d1e74e9c1233b9012952ef8a/13928536930.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/99252198761.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/baguvigowapo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfa590dad---40749389629.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/84848366329.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_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10640 bytes
SHA-256: be82371d2e206cb04c73178314aa23d77023ca0c55ea503142c754efa515a574
font_01_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 24288 bytes
SHA-256: 805e22d79afac7b7caf8df73b47dd813f97357bbd27ddfb8248d0084e2d2e25b
font_02_sfnt_off00014eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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