Malicious PDF — malware analysis report

Static analysis result for SHA-256 217262ccbc7aa727…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 09:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16da325728987963033852db41dafd29 SHA-1: e2d2bd1efcb070973f30077714a81fc6a9b938b5 SHA-256: 217262ccbc7aa72772f30848dbc28cc2a14790488c29ff55d811b9c720188c18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. It also contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://oniceh.ru/uplcv?utm_term=clash+of+clans+hack+update PDF link annotation
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/46692808797.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/23544426051.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3434ca179858ce9421051bb8093f83b0/28995190111.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/71848103236.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99307010476.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/30753717688.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/rilezetawudunigegasared.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/nadugimi.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/nixudavijeramabe.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/14020435627.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/vugobawifa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/20a6dd71fb91fe49afc5e945d5f83059/72525651557.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/96241060379.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210906060700827226.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/nelasozilekexagojulit.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/48635078001.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/ropadimomuzosul.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/2958674966.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109110707453612.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/duronelojakewirogolovoti.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/84249800493.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7df5303ad5372a4b5e46a675e4388982/lokivisiboliluki.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/35670656898.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_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 17444 bytes
SHA-256: ab953c86f718ce5639d3563327496615b1982f5ca7c20d9eaefd44bf2f0b5d85
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 10748 bytes
SHA-256: 3dc87c7749e7d747edbfc49a195f210bb227592fd7642f576a6c7a9c19fcf294

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