Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f6c284673f7894…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 02:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f39ce1fcfbe3878b80ea5674c098bc84 SHA-1: c1fc50281bb5d65c044191ad87de871fac27242f SHA-256: e9f6c284673f7894c6de6dcfcef7890d3dda7f33efa5bc34a9bb4295093c46a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://dunaweb.co/bg_image/files/gilodamisevewararefipesu.pdf In PDF document text
    • http://startent.ru/SITE/files/editor/file/verofavapagewaregetabopo.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/97295194979.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/tudal.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133adc5acd7d---degiwefimidugebojubakota.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/bunanag.pdfIn PDF document text
    • http://hkacca.com/userfiles/23117969354.pdfIn PDF document text
    • http://htygroup.com/upload/files/riwexo.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/83634185230.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/paxunumumomatufobofumero.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43921664818.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/71697597731.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4f9cb9671ce4a532a6b0a5ae98637baf/42993587246.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/25031482428.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/553e81867b926e47458c22d47a19da68/malulobedutanufowutuso.pdfIn PDF document text
    • http://www.bash.cl/media/file/28625124874.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/pagifasi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e63a6786ca---nozumepepajexunufegotefex.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/ximusogaforafas.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zexojutazi.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/zizeni.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/biduzotibudofageki.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nopuwopumetafojewina.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/pomoxonuzomewosudow.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cca6c9f8c---14837662473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=no+sms+connection+androidPDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 14456 bytes
SHA-256: a1b8b36106b5210dba390ad8ff6761c64444a1d8affd8f23884f2229dea2a152
font_01_sfnt_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10464 bytes
SHA-256: a4c1c09df6d0aadd6061ddd37aae2fba9aee743867f576d94f65a5303a8539e6

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