Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe8944d8bcc55dc…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 03:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d7fdfe4b3729ddbc946eb5842cc29189 SHA-1: 5a9655609da6ad990620d0d40c11b3a67a2d157d SHA-256: ffe8944d8bcc55dcabd503747c7376492a2af9c8d0efd727e4bb6e2953fd7765
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9912

Heuristics 5

  • 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://madiagranitosilano.it/userfiles/files/tukiponitutaba.pdf In PDF document text
    • https://fullgame.hu/uploads/files/tiberus.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/034bcb1337f1e53a9efe1eaeb5835ab2/suboxiloxoditadat.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/58939967938.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9ff2e53a7924a584cdb615bde6e933be/vapoj.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/5538089802.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/90261398173.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/buxurakagiv.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/88081222299.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/67654850147.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210810185535.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e35786dbd---rikivesitugudosufun.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5b3879aa17bc0f50d40d6b6ef4ed3794/19734926429.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4a1652d1---josenufadawakonon.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/lewumikisuxigudux.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/60987002248.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/koseligubolemegozoko.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/s0g46274333imp6l7i3erdgom6/motavidazomarajajowowux.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/532aa74797948a5d3f106fcfe340d952/34568465043.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b668a523765---gugudimabuko.pdfIn PDF document text
    • https://tekartltd.com/upload/files/32818342292.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d25f2e08---zofojaji.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/bimivi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/28527039778.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/pdr5nsd6f2p7h37jpf4bl0j8o1/54281446919.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/323fjl0j1u1v8nf794vpjn5s1k/77062897055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+pass+dmv+written+test+californiaPDF 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_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17500 bytes
SHA-256: 8b589048f8f9f8e1a8b5a10808b3de357728cc936ce1905f2fcdf3900145bf21
font_01_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10924 bytes
SHA-256: d0ace8daabf5fcffc6a88aa4e7f516f0fec7640eb4f4c7457b73b692dc30c3d4
font_02_sfnt_off00013c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1