Malicious PDF — malware analysis report

Static analysis result for SHA-256 942086b74e4b2988…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 15:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f91ff2392524b12e15499882b492f810 SHA-1: 3a0fa1c935ee3d5f94a8733e9f3e4e3487bcaf7d SHA-256: 942086b74e4b29887080413d8f7953ac292d30d6c0fd8d1874f89d4bee4173c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://noithattamphuong.com/upload/files/sinadazabalasazipumel.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6f813dc8---78773027554.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/biadhj89hlg5sj62q7ccuja75l/44306719236.pdf
    • http://ukrkarta.ua/fckeditor/userfiles/file/79594775148.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/17736392204.pdf
    • https://marcuspietrek.de/MARCUS/files/file/98639922221.pdf
    • https://gymlesgeants.com/upload/editor/file/koxomixodifijotulovidubu.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23739517883.pdf
    • https://serviceelectric.ca/userfiles/file/pazenekizija.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/venazedusokiwitademux.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/womufefowimevemu.pdf
    • https://tasleemdubai.com/userfiles/files/pitoza.pdf
    • http://salsainkonstanz.de/media/files/jisezoxikunebok.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/89640525401.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/lejizesilukegesizisiv.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/dubupum.pdf
    • http://www.findvoters.com/userfiles/file/34269058707.pdf
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/34236359719.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/i2575p8noii67qnij3lsots3j1/10965553372.pdf
    • https://digireg.at/upload/biwedi.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sikixiruxijovivirewotip.pdf
    • http://bilafafafa.com/shopadmin/upload/files/xumimopemenuluxiduwifapan.pdf
    • http://ocean-ex.com/images/blog/file/38936938723.pdf
    • https://onecre.com/images/content/files/remos.pdf
    • http://baheth24cars.com/ckfinder/userfiles/files/munujukutejixe.pdf
    • https://kawanmto.org/contents/files/metalomewavamujuvadili.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/334767b92dbc0ceaf33f3e602ae07886/dosawebubimatugoxapamel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=american+association+of+chemistry+teachers+answer+key
    • 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_off0000c023.bin
ed6f9352e9391277e4e5b08cfa2c3d45d2a28dd021bbcd16a1e3466171ea6ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 10828 bytes
font_01_sfnt_off0000d90b.bin
482a8770f57c8ddc461973e6d9656101b702282369006a693880ef1b7d9ca73a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 16584 bytes
font_02_sfnt_off000103c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 16792 bytes