Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe1a233ed5e26ee…

MALICIOUS

PDF

101.8 KB Created: 2021-07-19 20:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 280930e15ea827c55ab642ca6e8c6af0 SHA-1: b997e4f5358af07b87d0cacdbd55be3bb86c2415 SHA-256: 9fe1a233ed5e26eecda02230ee6e2b714a80eafba238af252cec770bb745e982
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b569ea77116---73051029899.pdf
    • http://bijverhoeven.nl/uploads/files/42241674502.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4v5h6bkfrdud4fsr6tpskssuv7/jibuwe.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f8c4827bf---fidorizadogejenareruji.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3f1fd7da113befdfc4084f0a9a1c8391/27740956700.pdf
    • http://classicalgardenornaments.com/uplds/file/42836879519.pdf
    • http://sh-songshi.com/admin/upimg/file///jajaluvikujolokusu.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2dd1a9684---91454916012.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ae96be28bc404ab8f4a59f547e08ac55/gerafetewixifolaf.pdf
    • http://architettotoma.it/userfiles/files/zugat.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/1ncg9o1u38e31g9pv1dprmq1cr/dubub.pdf
    • http://blow-w124.com/js/upload/files/kabotigenexuv.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/20f456573beede88282c52a6ee87a521/batadelupirezo.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8056ba302---nasefage.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2514vqdrnncq7b4elilssb6dv3/dozikeporazovidetenufor.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e71108dda---xutinakogojakutomejorafu.pdf
    • https://arerp.kr/data/file///telanabuz.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5solbuls2leluclhv7tp1cmalj/6600656757.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c1cc8389aab8742a137ac4d15ff77834/43640004388.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd4b5e4303---gutotibuxumunezopeta.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/892be9aa02547f69aaf049c4ec246fc4/garajurizilewesuladal.pdf
    • https://arerp.kr/data/file///nutevesipi.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/b2fn5arh3u88e3p4df7etvfmo3/mimibemakoderememumar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=army+separation+code+jkq
    • 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_off00012b7b.bin
bd587d88853f2036151ff9cd781ae0b83ac0727dce054bfa60e4ba99152a78d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 11092 bytes
font_01_sfnt_off00014526.bin
a40f8ddc5488cc4e3b35dcc69cb2c736786dbcc059858ae4804d746c82fd1781
pdf-font-stream PDF embedded font (sfnt) at offset 0x14526 17088 bytes
font_02_sfnt_off000171e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x171E0 16792 bytes