Malicious PDF — malware analysis report

Static analysis result for SHA-256 902e217f19b291b0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 23:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a167689aa9a155b65f75e9a745ca274 SHA-1: e9cad527308a008120dfd079b0c1cb1f41f2e01c SHA-256: 902e217f19b291b09bf3345a3b4effe52922d7ac659f0d9dbb95ca5f4dbbbb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pixomot.ru/uplcv?utm_term=d%26d+3.5+character+sheet+pdf+editable PDF link annotation
    • https://skywaynepal.com/userfiles/file/12482062771.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/5977847619.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/69516736822.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344b8649cd6---56376105178.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fefazogesev.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/7071883916.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/72617821960.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/wazidorarinojakegaxi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138cfb707f6e---jonexozoxopovasekebim.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/90395727687.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/coec457nhsrpfr9v4rbp753qb4/87761842646.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/66081531196.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wevejorefevenej.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gedufokivodukav.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zewilozaw.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/zukupelakujamixakop.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/651ff052db473483bf027641c5ca7f3d/38224811005.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/11881434221.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/54817782627.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/mikufemalorekivesalu.pdfIn PDF document text
    • http://sungder.com/upload/87806205820.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kipujutodovemafex.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/2655931464.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/29650459935.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/koxodofexotinavon.pdfIn PDF document text
    • 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_off0000b8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D7 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 19744 bytes
SHA-256: 1b20421efb8dc6a6d7969da6f5d984adf011e072c6671f70813d9123642f1ae4
font_02_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1