Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6734626fc0221c1…

MALICIOUS

PDF

92.1 KB Created: 2021-08-04 01:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1adf5f5e337b3965d83fa6dea9f1ab4e SHA-1: 4335adf5f43824059d6be72f29df727fd265529f SHA-256: c6734626fc0221c14cde62b7ba26382f6c2836ad2318a534d42fc141368bfa4d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://alliance-ltd.com/userfiles/9833747078.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/34900652916.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/jomukexikuvefana.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df886cb9396---26498076579.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a068173c0ee---koxolimaxoduj.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/28966838764.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc2b4a2d2---59435904272.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/17026974412.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/pimuxi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9pckv5en5m2gi2notrqnhnlkdd/35168125421.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xaveturifep.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/duxepixupadinuludaw.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/81f7750e408012220a2f3d7563a2fb5f/kawotafarob.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/60899813784.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/pagalajulavo.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/88397733483.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/jukuzirorowujaxago.pdfIn PDF document text
    • http://itfind.ru/uploads/file/15793747077.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/73873758986.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/092ae537843bc80ed78889d8c9fa8314/30999552815.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bffdf0b6---4473103386.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a59872a2795---depida.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/k60a4gg38njmstm9al3u9env9q/32167785891.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/49340595808.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/67097976155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+beachbody+portion+fixPDF 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_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 18076 bytes
SHA-256: 9c02b8012726579ab4e8f6610a18b75e5be50e4508a5e25421e6c6a205919845
font_01_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 11020 bytes
SHA-256: 77b969f090f923a8abb3220ff9d5fc33763b5116e42fe2810b4cd8f464de9b69
font_02_sfnt_off00014870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1