Malicious PDF — malware analysis report

Static analysis result for SHA-256 5536bbda0f5368a3…

MALICIOUS

PDF

72.3 KB Created: 2021-10-04 02:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b1c10c0313c808de3bcd820ff8cf43b SHA-1: e6b51e2ddadd4c6f37ab970ec8ef7f8ffeaa6e89 SHA-256: 5536bbda0f5368a3edd336fee1f11e5b9e67fc20c444f76dd3434f41508d1426
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thevisionkharj.com/userfiles/files/katatilapidifetakazivup.pdf
    • http://coyada.com/up_images/up_images/migenenuxigilo.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161594962835ac---9379388478.pdf
    • http://jingyilin.org/uploads/file/29166151786.pdf
    • https://tivicom.vn/upload/files/64647370515.pdf
    • https://siroyensao.com/upload/files/gevewuminawafebesizuted.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/tofalibititixafulobovidu.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74893067621.pdf
    • https://textosl.com/upload/editor/file/sozaji.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156029527cab---58871304763.pdf
    • http://rafaelstore.ru/upload/files/93328169135.pdf
    • http://ruresept.ru/files/file/4943890613.pdf
    • http://edu-soft.ru/site/htmlimages/file/vedevoliguvulalusoxano.pdf
    • http://egitara.com/upfiles/files/pofugokapesenubuwopiluwil.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/32662746993.pdf
    • https://goodmix-psc.com/userfiles/files/xametunewejobavozamex.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/guvalemuz.pdf
    • http://zzweien.com/d/files/vitav.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/juzasunipodeximurobazitet.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e9f4e9d11119565f4ab475c0a219ce74/tusewubepugapopu.pdf
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/98865708354.pdf
    • http://castel.lu/userfiles/files/luvikuti.pdf
    • https://sd-olimp.hr/files/jagavogasagolipido.pdf
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/vufake.pdf
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26000049695.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=car+rough+idle+in+drive
    • 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_off0000b9f6.bin
f8891a087a7dcdc3bfec560570f26d1e6f00f86a8d0e813bd4e4ad6851f991c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 16444 bytes
font_01_sfnt_off0000e3bd.bin
6c75348cd99eb582114f06df4d0e3b932b4bb96d87e1662bfd08036b0000c5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 10456 bytes
font_02_sfnt_off0000fb2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 16792 bytes