Malicious PDF — malware analysis report

Static analysis result for SHA-256 58235a7fcb82a68f…

MALICIOUS

PDF

85.1 KB Created: 2021-07-24 06:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a26ccd89930ec78fd7f307838e8ec23 SHA-1: fd97c499dfcefea510ed8edcb8db42977774e5ce SHA-256: 58235a7fcb82a68f4c09fc8658c7ef890bb24c6a238cd890755ad20c25b137fa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://keongracun.org/contents//files/keriwanelulasimivigix.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0ce355f7---30309390238.pdf
    • http://school19-zav.ru/userfiles/file/49998360723.pdf
    • http://bet-balance.com/userfiles/file/gelirelarudujagojar.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/boxikutigu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ca9529e5---pidubitixedugelujox.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609231d7c683b---94619859950.pdf
    • https://markmont.eu/editor_uploads/system/files/fazukodiwafipoturegasa.pdf
    • http://immobilieninvestors.eu/userfiles/file/95155192692.pdf
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/8011056882.pdf
    • https://kipass.fr/userfiles/file/98164608875.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0qdaavrs8e5atuvpp9eae9cc75/gafisu.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c6f23223e5fe6078d4882bc581ef5f02/35632407571.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3e6dee29---poxexawi.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/37135856766.pdf
    • https://bulgariapools.com/contents//files/63823573566.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ad76146340f---xubiwebet.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608373485d0eb---19045360965.pdf
    • https://bachson.net/upload/file/tukepamasegopebu.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210513019168.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1013c991c---rowugigosivesebelamot.pdf
    • https://fonixkoncert.hu/upload/file/9148915208.pdf
    • http://carscaso.com/js/upload/files/futusomop.pdf
    • http://md-servicios.com/userfiles/file/davofolivefukadafixawir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+calculate+cable+size
    • 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_off0000ea34.bin
ac22d9f99f6ac54045554f86983e05c27d1c8f90394ed30056a156c63699081c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 16916 bytes
font_01_sfnt_off00011677.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes
font_02_sfnt_off00012e8e.bin
5c3d666217dcec477c4e9dfe0bce4bfbf38d3887d5b7d8519475f7aedcf14051
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 10396 bytes