Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4373261568477d…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 21:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c5cf18cb89e7c770edb496d06127312 SHA-1: 6465da08ee43e7c5e1851d19a2abeac27d55eb49 SHA-256: dc4373261568477d8a88c91dcb8a081825aeed234d2e04c73dfccffa688bbf25
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

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://hitourkorea.com/FileData/ckfinder/files/20210612_7DFEEC34A780B406.pdf In PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb443f802---puloxuzaxivejo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a331026a1---59433069277.pdfIn PDF document text
    • http://modern-pro.ru/files/file/5072102241.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf09daeda---30228085537.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/56007666084.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6aebc356---nodigaxisu.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/sagulilojarerokuzumin.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/vowopuwisone.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd501c35d---11796601660.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/69989959575.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/jipanobapofakodigajenil.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/72632185853.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9f6f915fb8d0b2b20da855b08cad03b9/jesepegijeketik.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112ec3b3bf15---debudiveputuval.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2b65583ebbd77f6ee9d14f0adfa3d636/95363886337.pdfIn PDF document text
    • https://tsegypt.com/file/zuderaputefebigis.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/17257413295.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/98196633136.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/benew.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///58367594287.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/59202000456.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df1163f1b---rezatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=courage+to+be+vulnerablePDF 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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 19128 bytes
SHA-256: 9aebf59b9e63142a595abc6f7464f3fc48cc762300c62a26c71b0b4fc1e7fa3d
font_01_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 10360 bytes
SHA-256: 838ae8b8ab7196c00e74d802dde89dd3afbee7e3ca9ae0fc127117dbfcbf6ec4
font_02_sfnt_off00014130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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