Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f66dad6d3a47501…

MALICIOUS

PDF

252.3 KB Created: 2021-08-23 13:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 621047451fb464f0a970f471d4e9623a SHA-1: 2cf948e47f004fb82f05be412ee38b16d4a29e67 SHA-256: 3f66dad6d3a47501208c554ee30d07b50e8ab7fb6294e283c2ad3fdb3c4cf6aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7681

Heuristics 5

  • 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.
  • 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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/3gu2erg7j2vsc2sc8g1s925ubh/86889254810.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b07364ec12de6ece73535009bce2c068/63811434740.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/74890576806.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab49a087c---dowasametozukawotorugo.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/69420277478.pdfIn PDF document text
    • http://mabuksusu.com/contents//files/10532738769.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa914347f---xideserewano.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/28196003969.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3bad2b25e---fosejo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738a4f79fea---9986249165.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/41588678459.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bc09083c5---xavurudar.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/afq99lrbsnj853o74qg6h90116/wezepujopuxifamozam.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea330f0a79---zuparolotanid.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/84729237206.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0954a356---82992894294.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/buzobibudakoguxip.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/74450379634.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609277b4bd7b0---65981766443.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/76d2d4881e3abff425c63aabefa8fc45/45395977553.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b8acbef2bfe294d2b50a6a2068229446/23336636358.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jivixafexisenane.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/baludojavopisigerilozugaf.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b43ef93d364597f5520f2245fa4101cb/somepofuzixetunokuroxar.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/zokibosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a+5+molar+solution+of+h2so4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000361af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x361AF 16476 bytes
SHA-256: 515ff7679fb0af230c93dadf4521a8d063540644827c0550c46899938467db54
font_01_sfnt_off00037857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37857 20840 bytes
SHA-256: 179fe24749183fec0de172cd3a4291ccd6d1e2842bd2cc505faf6f08c9afc895
font_02_sfnt_off0003b00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B00F 10760 bytes
SHA-256: 67648f561541e92d6b91b867bfc70035c6f4e4dc0c804730a2cf07656f3f78c6
font_03_sfnt_off0003c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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