Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14f3f5c2ddb5c50…

MALICIOUS

PDF

80.4 KB Created: 2021-08-29 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 543c4f5cc72e5d6a4ae9cf5c3ddcc9be SHA-1: 903c02009b314ed11a51538737bedb23f1e6fd9b SHA-256: f14f3f5c2ddb5c504887b921dc62dd382b1e85b20b74d8b590b6cd066d77e529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://suprizpin.com/calisma2/files/uploads/bimaruvobipe.pdf In PDF document text
    • https://rumputhijau.com/contents//files/rikezunowugodepatiri.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/tivodogenone.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/empu9ub1ivuutie9fi2rhlap83/46875968708.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/fowidivumejipegakolefi.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/36322595026.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076709f8ab6f---51535987187.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/70803774759.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/90e5be503ed5bfc53e7eeed83ca75e71/11041459848.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0222ede1d283e9719d678fac5522fccb/86266154451.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/64ff7e0ce60e74816c87ef52492b040d/70933466672.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9660a2622---nusuvawogarivu.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/rudok.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/feforakik.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a423e68a2ba---juzela.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bc63e2e73741eddde8b51a9779e082dc/35156545580.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e6824c97de4---62423665914.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kajumemixunugipedixupudo.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/woxoza.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/51767376283.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/65123329888.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/7331019843.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c19c28e752bd1a9dda26b542486f0ef2/79519105712.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b922dea0---16137218062.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111dfc08007d---98447149123.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/74694193545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=king+philip+and+the+templarsPDF 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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 17824 bytes
SHA-256: ae99d567495066a84dc481703d3e1bb5dca6e91921da2117c465a7d7942c15d3
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 10712 bytes
SHA-256: 622f5ffa231f898d2ef60ad45f30119231ee1b2cb99f25d890d2c76993c96697
font_02_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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