Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a081514062fb7…

MALICIOUS

PDF

78.9 KB Created: 2021-06-27 05:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79e57e7b830f153b25f65a66336199e8 SHA-1: 1c599a6d2be6c522f57b4119085165b231ab8896 SHA-256: 3f8a081514062fb78682137bfc28359320466e199f91b83561a5dcc49b6de624
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage legitimate infrastructure for malicious purposes. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4f8574c4eb4f3e8682c981bb6d190bfe/38837039470.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f2164ad478f9b7b5ef2e3c28d55bcc4e/16841286713.pdf
    • http://sk-massimo.com/js/upload/files/32997560680.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/19967267443.pdf
    • http://leaguengn.com/userfiles/file///59865723962.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210607_45A243287E4ED444.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/86548743281.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/susar.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5299d3fdf3---64249389789.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ja04uos13e0likpdsa8dh9p5qa/zorivupuminenetavozi.pdf
    • https://zlato-eu.cz/upload/files/20906991320.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/2896974435.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6990819f2eac9dec823442cd2d4718af/bunuzuxigat.pdf
    • https://777mto.com/contents//files/64571091928.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160784aa7aead3---nemerofogexaxawofamogexa.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/rewuxew.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mbbqa0llqg0o2smek98fgq442u/watuwekisibo.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/772135ccee223847674a56135fd15902/52080534714.pdf
    • https://dansobentre.net/uploads/file/6823321721.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/44969327660.pdf
    • http://www.asslar.de/downloads/15869412693.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/88a668e8e74b0def167dc18a8ac26fb6/77461711933.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cf5610c14bf0d26f32dcc5e9a2680b9b/39241847773.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf471163d08---gujewopajaxefud.pdf
    • https://castel.ro/userfiles/file/negavidesuboge.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/80789539279.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25ecbd200---rupimapufagekevuzipilabe.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075db4a33bb2---60658779292.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=why+are+the+days+longer+in+summer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f9.bin
bdcef3dd410efbed38fa84f1b2b63469aa2336926bdcd48d5a9363c07c430ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 16604 bytes
font_01_sfnt_off0000fd1b.bin
15fefbc449489c8d8cc3ee5f04034509dd39921dfc0d6fbc05458ce6bfb38462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 10904 bytes
font_02_sfnt_off000115fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.