Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c571d2fb33f34fc…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 03:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e1e63274a7b0c5df64800fda268cb7b SHA-1: 9b25cb1976c0877e20d09aa0022e6a8c550e7f7b SHA-256: 8c571d2fb33f34fce06a61d1f554099471f53e0f919c64904fdcf88de146116f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or delivering a second-stage payload. The document body is heavily obfuscated and unreadable, but the presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the use of scripting and link farms for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://huntic.ru/uplcv?utm_term=interstitial+lung+disease+definition+pdf PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b142cd93418---supugipazaxeruvugizog.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134164e1eeed---votosetajefusurufifatek.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1b9ced38c85d9ec5d1009053c1b30e7b/79087925647.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/76731680093.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac14cc18f70---76251211822.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/61929368587.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/80052460461.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/28005848061.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc59c37dae---24594148888.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284d03c868---61842688585.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f101b0ad61---59796915450.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/kovit.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/42698b05ddaa26369f044d39999215a3/68534924993.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/gelomumediraruzugolojos.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/binezokizakefawufajefa.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/29994824577.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160707fd9bb694---zivomokefafekuvilos.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/zuwovezoluwuxovitawul.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/8458777357.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8864883dff---joxatitipozipexateda.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/pimabemukulewuvereruvixo.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wesarolipolugine.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 16964 bytes
SHA-256: 80295b489b1a50dd17e8a3856725f86506c837fc0923e7c3f10a7e6ba92a6010
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 10724 bytes
SHA-256: 805f54b9cf235b4dee4fff31769cd18fca4dc007e77f3bf401a0d9bf2a13b490

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