Malicious PDF — malware analysis report

Static analysis result for SHA-256 9913f5399460d901…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 22:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3640bce8976af23acf8635d0891baf82 SHA-1: a00e1a98232e8c4047b7bf36906a39088f4826e0 SHA-256: 9913f5399460d9017f27da5f02ea6646e81189920ca85578e809c203ee664951
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gmkms.net/upfile_editor/2021/files/pazojezileninupazo.pdf
    • http://carshopm.com/js/upload/files/95277705344.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109211315205702.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/8377434694.pdf
    • http://pokemom2.com/uploads/files/56673433467.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m02pb5ja2v5tni4rm3hgike2n0/zafuxobito.pdf
    • https://penzionradvanice.cz/res/file/gilosukogekosogodip.pdf
    • http://canadianrockies.info/files/file/90523862106.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/58393831128.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045a72311f---tepigoselijutapajafoputej.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6b9rds06hkoka943avdd8tfgbi/bumikep.pdf
    • http://clubselectionvoyages.net/images/file/22253776832.pdf
    • http://budka39.ru/files/19507152374.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/52833787365.pdf
    • http://hanasushimenifee.com/uploads/files/lalotirin.pdf
    • http://qdsenfeng.com/data/files/73645933901.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/bapogepuxilaj.pdf
    • https://vcvscr.cz/www/www/fckphotos/file/baret.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k7vdruv19nbts48v9sh1q41d2m/27850497445.pdf
    • https://aromamarketing.md/img/files/nuwajozad.pdf
    • http://pluimveebeurs.com/userfiles/file/kogiximosazur.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/39805994204.pdf
    • http://spineportal.de/files/file/kerojajakugafek.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8910ca94e---33296984235.pdf
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tunumojarizubu.pdf
    • http://jinruily.com/UploadFile/file/20210924135655420.pdf
    • http://jtour.vn/userfiles/file/wakezavebodinutolab.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/pepawo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ar+sdk+for+android
    • 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_off0000b7eb.bin
be02d943b73a0c3ece731bb523a245ffe4f3b515550e66a007288ef2e58a52d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EB 18640 bytes
font_01_sfnt_off0000e83e.bin
a37478fb82ccd2f0d292d6a5f5249945232605107fb05c76e559230032648a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 10144 bytes
font_02_sfnt_off0000ff01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16792 bytes