Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd4f8cdfcdc2f57…

MALICIOUS

PDF

77.7 KB Created: 2021-08-17 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2a9a574f9a3f823770b8858b74215b3a SHA-1: 6175f97b15dd43c79db73f9b7aaa693192ca8749 SHA-256: 4bd4f8cdfcdc2f57fffcdc49460751a684b06439000b4b731e83627cf836d4f3
156 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 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/343e7f6f9296513aff5c3353ffe0a571/85901370517.pdf In PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021042908323673499.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mpac0lakon65aldffd46r6u204/xixutibosuzakuninibopaju.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/23647845043.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4a40e86f8---99504799767.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210716_DD9DDCF7D8F7D95A.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160930e047ea35---98955591441.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d79f4f10cc---10563707561.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/gewowafokukofaji.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a91f3a28d---67631592555.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/23530081231.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/71af91bdb71ff085f90e534c803b45ed/kuvifujalure.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/18865362235.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad9e18c72---4326534899.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/56320190946.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1561cd310b8ed312c19f67a05142f412/19615624845.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50b6a32b1---40704992058.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/jaforabepemag.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/wesefe.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/gupojidi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nofididobekirudawid.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/940b5e68455b7b4bfd6db3741bb969d6/87334655616.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef4f0c491d52239390ba5474e6815683/42617083860.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/tezibuvudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=anarchy+state+and+utopia+full+pdfPDF 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_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10912 bytes
SHA-256: 0fae1e65f7505b9a48a10aeda7d717132ae32bab977a5d5dd4ebd1330de4e6ee
font_02_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 16868 bytes
SHA-256: c03f7dac1c58e932837fb8a1a28e38d891309a25738e05ba9cbb8b5c0f7f5ddb

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