Malicious PDF — malware analysis report

Static analysis result for SHA-256 c155350f4591eafb…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 16:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c0d242b006b2ced5946f26dba7fadfd5 SHA-1: e2a9807469e68a59028fc9821a7e6ff67e24135b SHA-256: c155350f4591eafb1227fc0ace68af08e7f973715659f730a6dcaacf9ca94570
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of malicious links within the document to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://hanstime.com/userData/board/file/40245196031.pdf In PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/66f7ab59d37810ee96aa5ea331743b04/39111799737.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/sunivewamepepofepi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f88df4c5---25081522153.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/kamara.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/janejeguvamotesiboredapof.pdfIn PDF document text
    • http://pnalog.ru/images/file/fuxibobibataz.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503397eccf3---kapodabukawimerog.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/rijugakibewetexupena.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210915181959.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/nomatizeruzupup.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/19960376481.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/10322262963.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0416831745.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/73029088073.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/42588371585.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/pawazazaroge.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1c51f6e4---rumedakamelanasodege.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/68802263440.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/kugetimerazoledubos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613417bb425b9---matopodubukagulepuga.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/98812002841.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/menugetamomimetusekiwofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dua+for+protection+from+bad+thoughtsPDF 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_off0000afa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA3 11264 bytes
SHA-256: 9ef86a82c6c841e687f154f873378d8e5a6c0f80ab6965f9d369ce0cbe91d2c5
font_01_sfnt_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 16088 bytes
SHA-256: 2fc649e267c6ff0a0dd74c6dcd46530c74e184b6374889a81570b6087ff5b60f
font_02_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1