Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c933832b77f761d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 04:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e2672a81db9d8df4b2f8836f86c2385 SHA-1: 5546338c48e62cf4d223cc0d972aa34d1c866a0a SHA-256: 9c933832b77f761d51c9bf522d1dbf311bee7dca46dfe4fae261f3c93c8483c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=the+dictionary+of+body+language+free+pdf PDF link annotation
    • https://self-storage.sg/images/uploadedimages/file/lesebexebatunebikufo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/73fb5668340458b1f51c1df13df2361a/72930839158.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/58062235638.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/86194055459.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/wuwul.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132a612dd875---83785523543.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/95868915802.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2299572260.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210906_FD3CC3FAFE8260B5.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/simavisug.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/fowidavijeropixenojepivok.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vovusavuka.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/7067292185.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/20666849326.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3692ed59---kazavavenudiwejep.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/90069886223.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rasexutagifunitemus.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zobugasulukozenan.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/5248500777.pdfIn PDF document text
    • http://topstec.com/d/files/xipodukuvakumuvob.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/lifodas.pdfIn PDF document text
    • http://asqcert.net/files/files/83300098156.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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 11048 bytes
SHA-256: cb5824cf322d4d56542f7f4c2ef17b9c9c0067d49dbb4436699bfc358a336a9a
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 18828 bytes
SHA-256: f9f3cc1070c50c825503b89d9c43e646a4b510ffca293b5c9f40a1cb57363e2d