Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b4a523012e2eee…

MALICIOUS

PDF

77.0 KB Created: 2021-10-07 12:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69877fad2eab8bf7d69bdbb9e7cd9b91 SHA-1: a2ac8b8f39259daf2231b22dd792789dfe8aaa16 SHA-256: d0b4a523012e2eeea3e1a47844d4b1a2c1f29aed85f771410fe05c30e7791f21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/63731451402.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/46466492028.pdf
    • http://dotbamboo.com/file_media/file_image/file/41165359455.pdf
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/53626190792.pdf
    • https://hoangphatdanang.com/uploads/image/files/87853134941.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8e396ba6f5dd14a4bffaf6eee4b604eb/89629687272.pdf
    • https://ipmgrouphr.com/uploads/news_file/98247309857.pdf
    • http://divelife.kz/files/file/dumemipizafozenajifa.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/wugalumeje.pdf
    • http://abacusnancy.com/userfiles/file/puxorevamasotokopi.pdf
    • https://cakesandcupcakes.net/userfiles/files/luneripaxodijivu.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/835105d7ea8b63ae3632db53cf9ba183/rokobug.pdf
    • http://capesociety.ca/uploads/files/rulezokelilezo.pdf
    • http://wakabaeducation.com/userfiles/file/83900730178.pdf
    • https://ladymamashop.com/uploads/files/202109302305202999.pdf
    • http://shih-tzu.ro/files/file/58998277272.pdf
    • http://gutachterbewertung.de/userfiles/file/savuwafubejinakikuzeri.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6ae380847---vesuwenopemokababefajoje.pdf
    • https://sudahhabis.com/contents/files/jenojibexa.pdf
    • https://sma-dfgg.org/site/admin/file/rimifetawab.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fupuziv.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/806llgtfqqp19qkntg8keieiif/zetosawosemimukujivasog.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/kixigorezuxoxekijax.pdf
    • https://mkart.it/uploads/file/doraru.pdf
    • http://yuemeism.com/uploadfiles/files/wakizawefolilewiduteter.pdf
    • http://lj-group.cn/upload/files/fonexej.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/fugamumuwexuvemumupix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=in+the+teeth+of+idiom+meaning
    • 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_off0000c8fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 16792 bytes
font_01_sfnt_off0000e112.bin
02df77863d67d6408c34f13b571cea7cc18aa39f08ef8e974bd0e3cf0b5c6177
pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 10440 bytes
font_02_sfnt_off0000f84b.bin
c2fb0ac7f0a5cfd388f2782759f9e548369871ced89fb711530a5ee77aa885f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 17896 bytes