Malicious PDF — malware analysis report

Static analysis result for SHA-256 a153f534eda6f06e…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 22:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f60ad6d9844b5f8adb71fa21bcdef1f9 SHA-1: 1daa317cba9072573269a18482c6e01dc629cf37 SHA-256: a153f534eda6f06e1f9f11f0dd8ee7d2979b177c65995a88d59e0d487a5afbb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads. The presence of external URIs and the compromised CMS upload link farm heuristic strongly suggest this document is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://catamma.ru/uplcv?utm_term=ark+survival+evolved+scorched+earth+caves
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4cee0e0---59174550660.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472719373e---ziwujubaweve.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/25574460138.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738e246a587---tuximunimawilonapiseriro.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160860e87c33d7---24892524710.pdf
    • https://hosvagyok.hu/userfiles/file/lejuvaleninibufuza.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rpbrb1p33lkisbnr425pvm6f59/9188326078.pdf
    • http://hzjksj.com/images/upload/File/lefixadevejeru.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b8f2d47a1---vekavevimadulurodizi.pdf
    • https://bamfieldrental.com/userfiles/file/1770436882.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/51000930065.pdf
    • https://contabil-fiscal.ro/mm/file/wowisusujuvisodesazibikux.pdf
    • http://matchonusa.com/uploads/files/xubekolibapena.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e56ef858a9756de8028f445973b38e05/vamuxiramotofomivi.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089a85ea157a---gapisumuvujutokisizugi.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06b93cc66---fojudo.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5a6ea634---73893839910.pdf
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/fozax.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607053ca77652---45474249392.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/c8c28dkf6vq2st1qcs1lr0h1ma/totuvipexomoxesodikipene.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/86420d502c03df757e923f676c35ce06/50276899040.pdf
    • http://ankamet.com/userfiles/file/63660487523.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607279c530030---36002250232.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f115.bin
4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 16208 bytes
font_01_sfnt_off000106da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16792 bytes
font_02_sfnt_off00011eec.bin
ca4789a75db3ecd17ecc551a32b0e631f8fe09d9e5fced9f2956f85ac8dcf4fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 18248 bytes
font_03_sfnt_off00014e80.bin
dd7c97be5b634706c180b3c4d59ef7589cdd4ed52b880386e9116c54719271f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E80 10600 bytes

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