Malicious PDF — malware analysis report

Static analysis result for SHA-256 7794c42a64b232d9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 01:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41025942776fedd51df5403fb01ec9cc SHA-1: ade5a72055fdb3f6fbcf87e84284930a56620e1e SHA-256: 7794c42a64b232d9aea6ecd89cc0828d71ab49dbe4b6d79c431891bfd4ca827d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The high number of external links, many pointing to compromised WordPress sites and disposable hosting, strongly indicates a phishing or malware distribution campaign. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 6

  • 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
  • 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://processwork.archerhuang.com/ConImg/files/4388095415.pdf In PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/nexovupenowekazukugafi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9f8bf880ce7f5ebc079170158fe74aff/74240924250.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/bawilevomaxazifefobilozun.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321f3035466---dozolesakov.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93449201475.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413d06372c6---firosifegefumigufupiteped.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/fujijetibava.pdfIn PDF document text
    • http://proxima-online.it/public/file/tonibujafegumiparabek.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/67420124831.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/bujivonurunuwoxa.pdfIn PDF document text
    • https://spacio.hk/attachment/file/11982919922.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/badasuguzosunex.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3653de26---virixaxamodobuz.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/29271022995.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/ruritimawafebi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161372984f1ad2---35751572236.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/fafumix.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/zuvamevotigoxopagug.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/66561820531.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/13001219096136c130ad27a.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/vemixa.pdfIn PDF document text
    • https://onecre.com/images/content/files/remos.pdfIn PDF document text
    • http://e-district.org/userfiles/file/18605721624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=install+minecraft+for+free+pocket+editionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 10824 bytes
SHA-256: 1e00dd801ae5797033092a405bdb35ca77d691015475da53970b3da0434ca995
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 17516 bytes
SHA-256: fbf86430548eccf12b3d6f27213452d1b13895324fb351558c4e0ad24a4f9d5d

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