Malicious PDF — malware analysis report

Static analysis result for SHA-256 18af1c5d6eb35aac…

MALICIOUS

PDF

101.1 KB Created: 2021-08-20 23:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 52196366ac9405bcda498ec02847d351 SHA-1: 78389cc0dd77bdd4e778cabc15b59ba87e9fee2c SHA-256: 18af1c5d6eb35aacb2cabf9968a2cc7ebe43186b8390d633f06b5fa00b39669c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites and 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff0750834---gapimigubaxeriwonagego.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610445fc85969---vodutodureruliwilali.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/4836113440.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/94724717473.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f63ece4---56991712314.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd054b700---97777725506.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d033dc392164c39bbcf6cee30f7a31e2/biviziko.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/sonivakadajesus.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5ad6d1ea1fa40dcb7eec6628fb34451b/zexosododinezokasikeref.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/radivegexukix.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/70c7696873e718579ccbf02980c18837/kunomobiva.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a24dd7f89---jonisi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5g804gam2uk9u8khn3llfnnah0/wetojaveb.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/71822327179.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/57339106169.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/19474404020.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/85002395378.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ke59d9idbchbhj3i6i9dgbflfu/93629708936.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ad2ce2ed5dc9d1505e1437c38f007c91/vusujetonijopikete.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/papoke.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/24450396517.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/26402d79b064aa650f8a758c6b036f82/48673576169.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8213b6bc47c8874bc151ee422ddf0c03/86216442836.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfcc2b55c0---kerewujaweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fnaf+puppet+real+lifePDF 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_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 10140 bytes
SHA-256: da00f75dca17af1931f73f28ca8e8bdeca99da4f9661cafa196566aa4d1e7dd1
font_01_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 18064 bytes
SHA-256: 87736e47b124d5f06da5f85feb1c27b6f0ae0487c11ab8250a43eee930f68459
font_02_sfnt_off00016d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1