Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28d676ab1801a2e…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 03:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e967548715906e884bf6e19967653b97 SHA-1: 44a2565c8bca4a86e4d9b057ac094402b1639985 SHA-256: b28d676ab1801a2e6326ed74fdfec170d31ebb778e2bd63a1461b8e81a1fde01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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 0.9932

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://archism.ru/uplcv?utm_term=answer+for+you PDF link annotation
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f62e9db607f35231a9b5551550bc0e5/bexukogineporejipigi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096aada2af64---xebotafurizokunobe.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/wisubaveru.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/jejeke.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/fo1jk8dchv38f50cqjjrojd5jg/dekibumima.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/diwarivewokalironorur.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4r2pulb10aeml3tmf9idta3mqk/serijasej.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/222jo1lb3qrtqf0c9hgf16e5na/75169478788.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f279c624c2---xoxisiso.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f90u6ocgk7vtcc1fic38g7op37/gemik.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/56496166708.pdfIn PDF document text
    • https://avela.md/userfiles/file/juxubiguweritefatamisufe.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed54aa86d---vanawijog.pdfIn PDF document text
    • https://akvaguru.hu/user/file/4812632178.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/90729398746.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/cb510f6082cae295c5b2d7b0914fff4a/negatigafutozedabu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7b0435a1---kurefiwanovifedimipe.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/48677949777.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/luxedokuzinopozad.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/51be9ff1485c5eff870b801c9d47c1b2/93319465141.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffffa516f---sorosojoxebimutedarigale.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/96465661364.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/wolabizumati.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 1928 bytes
SHA-256: 322aa38d65f6c86258ac32f37cfe855738c5fb65574142ecd16b3c7cca17234c
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 17888 bytes
SHA-256: b4cd404f039957adfe751cf408bd3335406fae22ad270b048b5122d51cc149b5
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 10092 bytes
SHA-256: d6c8875bb44b6733596e7090e30fc612150c7203d4c39b412b86724871e532b5
font_03_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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