Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc6b2f336d178ff…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 12:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 624cd29d534d5db9fe6e59ea5fd4168d SHA-1: 4a0af5892e02efdabf42fd91a6b34848bf057e3b SHA-256: 8fc6b2f336d178fff0ebb96502346bec82b599482655ca43de4dac7d9b3fdf14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to numerous PDF files hosted on various domains, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code, likely to redirect the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://premium-h.info/files/files/73914220967.pdf In PDF document text
    • http://beming.com/ressource/site-image/files/95356054905.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/85942556388.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/17652489545.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xowobesatemo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/6e8f22754b218d163405bf3a8483047e/16429456595.pdfIn PDF document text
    • https://hgb.se/filer/file/27565137578.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/587ee49cfc2cb58dbf2bc5654666870a/26979125499.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae95a0e2539---telitivasofalezilopeburaw.pdfIn PDF document text
    • http://electric-kernbichler.at/javomifukavaniz.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/zelawadajefolopa.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/0mfn00q5ri9p2tfipnobtam9g9/filuturupodaveritudoka.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fafuluxifesumuni.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/luzime.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/24239793747.pdfIn PDF document text
    • http://muszempilla.com/files/file/jixevimidofob.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jajuj.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/17004233624.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dufonovikolane.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/89906016512.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/vavesemunibaxutevidapuzi.pdfIn PDF document text
    • https://bunianco.com/other_files/File/tasagivirip.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/4f73a4b8d1fd59a3c87aac566cc74ef3.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155c7cecde---bikizufipogaji.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaac736a5f---povugorezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=amazing+grace+my+chains+are+gone+pdfPDF link annotation
    • 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_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 11076 bytes
SHA-256: 8c6fa380d2cd1ac92eff16f824f24a870e74e7fd05b8eb0ccabab10cdeca0ea8
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 18536 bytes
SHA-256: 150a0caa866bcca740aaf942635a735e1cf9284966cab450e5c0dba782b7fe5f
font_02_sfnt_off00011afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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