Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4103a5e214c484c…

MALICIOUS

PDF

87.0 KB Created: 2021-08-20 05:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8217bccdc2d3cdc1d8da7ad2b4bf0dbe SHA-1: 3052c0af85785c50dbd9e02daec0114fdfab1642 SHA-256: f4103a5e214c484cd9b9475281399ee61be7b66f587d77caba1cd899242ee1be
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a phishing lure, impersonating a cloud document sharing service to trick users into downloading a password-protected archive. Numerous external URLs are present, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://catamma.ru/uplcv?utm_term=100+snes+roms+pack+download
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92aaba5197fc82f8cecb4c0d69233556/pezafotozokedemigagagef.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29a411dd2---41392182082.pdf
    • http://dynamic1984.com/user_file/file/95960917029.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082227dc9d1d---zadoginaforowugux.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b2fe4fd73---21027474879.pdf
    • http://paillasse.hu/userfiles/file/meritaredozejaxole.pdf
    • http://kozelskadm.ru/files/uploads/files/rujip.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/vipozavun.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/bifud.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731dbc1b03a---bonagav.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/koketepopubatokizujip.pdf
    • http://lagunarent.lt/ckfinder/userfiles/files/tilemufuzasuwalogifun.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2659e940698da2c2ebfb544c82efd092/fuxanajo.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d5e35768dcafc765b0808549c8f64150/vusawirosaw.pdf
    • https://soudurelausiere.ca/upload/editor/file/77247832211.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/dogegamenexujis.pdf
    • https://ietc-oman.com/userfiles/files/4670076192.pdf
    • http://sanzmendia.com/userfiles/files/ralatekuzige.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/polabetujezimejul.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098c68b37267---sedasafitasur.pdf
    • http://primaneighbors.com/userimages/laxefenibepidum.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/dilifijazi.pdf
    • https://dalilak1.com/userfiles/file/3941751201.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3b709e48b200cf6331599ffae31d3358/tinufofekoxafura.pdf
    • http://paoladebenedetti.eu/userfiles/files/38164771037.pdf
    • http://stroi-sistema.ru/img/gavosinuxozawunaxevazi.pdf
    • http://blltly.com/1m48ld
    • 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_off0000f0bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16792 bytes
font_01_sfnt_off000108cd.bin
e63286dbc06171f516e1a2b6e3635ce1d6681424e80a2466e900a5bec995741e
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 17092 bytes
font_02_sfnt_off00013530.bin
0643edfe251e773503e4a6ba590af5e400f5956012693e40b23e352dcde9f5c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 10740 bytes