Malicious PDF — malware analysis report

Static analysis result for SHA-256 506ce62ea73fa948…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 10:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e6f200e3bc989753dcd4b8bfd89d32ff SHA-1: adb799fa3898ae5b4012ec4504e7daded03e15c5 SHA-256: 506ce62ea73fa9480f3250f1b6f0c4c899e4e4c12d478caa9c0acafe64c17f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of JavaScript indicates an attempt to execute code, likely to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://c-amc.com/upload/files/relikewosivogumo.pdf In PDF document text
    • http://tantos.jp/js/upload/files/gabopujevepusiwuxizulo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/thib7566b62mu4uj7gifi8svf7/75984475611.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/90620757484.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/8160646991.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11e32308c---dugetagupuvowoluf.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084597b44562---naxusavujozegifeker.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9e13b15be6601f92df76c956217b1157/83937633948.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/55882134646.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/54039418934.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2e2fd11c8b24759dd840ab44c3074afb/71017848159.pdfIn PDF document text
    • https://sy-tech.eu/file/59813477264.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/94811971706.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/zarexemofamedatufa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aa85e3709---80525820363.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/38339048974.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sujirebewuvego.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/72205935335.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105b03e3a891---redinim.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/wubosonaze.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/3797046503.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805280ee173---62290543717.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/57899522836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=feature+article+scaffold+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/4847339587.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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 10588 bytes
SHA-256: cee064d73bb6d8ce91facaf6bf08f58d5d10ff461a3b31ca00ebfa013c4fc7f6
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 18508 bytes
SHA-256: 41c68118253e7727b4bc55a640e67d0f74c308d2b385e18e337c722dd8861b6c

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