Malicious PDF — malware analysis report

Static analysis result for SHA-256 976c58890e79bebe…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 16:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c8f87c2e04288f7fd685e518a6450e6 SHA-1: 6c9452d0bdb3c3387ff9604b8d871b5aa55987b0 SHA-256: 976c58890e79bebed7ca2f0c5cfcb5ced98b9ef5abb087fd99909cb834ae687f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1190 Exploit Public-Facing Application

This PDF document contains embedded JavaScript and links to compromised WordPress upload storage, indicating it's designed to exploit vulnerabilities or trick users. The heuristic 'SE_REMOTE_SUPPORT_LURE' strongly suggests the document's content instructs the user to install or connect with a remote support tool, a common tactic for malware delivery or social engineering scams. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://www.sacict.or.th/ckfinder/userfiles/files/19149884893.pdf
    • https://myparrotfood.com/user_files/files/daporejulinekev.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/07b4bcd253dbe95fc091865dd0d3369a/45060587109.pdf
    • http://safetruck.gr/images/file/tozulegiganoxowa.pdf
    • http://abwmarlboropike.com/uploads/files/ruganagutajep.pdf
    • http://autoscuolepintozzi.it/userfiles/files/gogavotiloteboj.pdf
    • https://laser123.com/geektic/files/22906394161.pdf
    • http://kozelsk-adm.ru/files/uploads/files/84537856162.pdf
    • http://healhumanity.foundation/userfiles/file/wadipagexerubegosivujodi.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/momijud.pdf
    • http://shopcode.ru/uploads/file/9735863163.pdf
    • http://snft.ro/media/file/99638524235.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c1104730ce7787c98a3edf793106a3cc/vurumebifizutixarebak.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b47953eefab2b32770ada34ada4bdca4/55687115674.pdf
    • https://idd.no/ckfinder/userfiles/files/52848825057.pdf
    • http://rilta.net/userfiles/files/92492735716.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/fimuzemevodudenejitujepe.pdf
    • http://salonorganica.ru/upload/files/wazuzugilixadisuvejiz.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131633dc7e05---82901471222.pdf
    • http://polyalpan.hu/_user/file/leresekonarixez.pdf
    • http://autolavaggiocraparotta.it/userfiles/files/lakukozutomukomesudosilev.pdf
    • http://all-vehicle.net/js/upload/files/voreji.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/af5a6caf734195c940f95246a193844a/55269724223.pdf
    • https://thietbigas.net/media/files/39363718003.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=windows+10+wireless+display+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_off0000d078.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 16792 bytes
font_01_sfnt_off0000e88a.bin
150fba98faca3ad71c89a19e7fa52372b2d48a3b19b610b56ccaa332c2f3fde2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 17396 bytes
font_02_sfnt_off00011598.bin
fc5deb584d605d9745e1686b4639df050b179a8ae824481e9c00158f0c713483
pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 10652 bytes