Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8eb1bebfcc459cd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 13:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52cd7afeffb9fddb88df8af0e075238d SHA-1: 60eaab013ee8dec970a97c5f06bbf4e4b3b14c8a SHA-256: e8eb1bebfcc459cd8d69d02e898a8bf1b54d43bcc70723af1d3cd4450f86ec5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF is part of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239869aaa7---31511106899.pdf In PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/xewumipimotovobalilivu.pdfIn PDF document text
    • http://schubert-hh.de/image/file/wumavadobakip.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/18527907254.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/20807030847.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/72492276996.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/42344994218.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b151a515b---bumokewixutuvamisud.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee309cc3c---70028590963.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/pinesonav.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/1978274033.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/piwabitirinud.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/27808995196.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/10553999047.pdfIn PDF document text
    • http://mc-opony.pl/files/file/morenejifabofabezukikewox.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/36468362915.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/28387490802.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/48488455158.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7244ccc5684ef8865c6523bf9b1f75a1/vosofegarawetojonimepup.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/87894847297.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/81888935773.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/58958309838.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/92577769460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=iplayer+on+kodiPDF 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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 10276 bytes
SHA-256: 31deb620acd0a808baae6b889777a9b07520403d4a5dcee7ef35d6163fb9fa74
font_01_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 18028 bytes
SHA-256: 06e09b5d5e261846ca994bccaba7aec2ece243064a6e1b7ce5685f9b025fdb15
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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