Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ecb11c98c70dd9…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 23:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb65f85176053c7c683be74586931556 SHA-1: 659291b19e56707f2282b267f887ffc5eaa86b27 SHA-256: 24ecb11c98c70dd9eb85c587e372258e91a9268105313e831bfdccd2118ee1a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, characteristic of a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to redirect users to phishing or malware distribution sites. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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
  • 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://agro-pasz.pl/ckfinder/userfiles/files/40943507947.pdf In PDF document text
    • http://wellfoto.cz/pictures/files/pepumogikododoru.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/85928216504.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lowekoguluwodivubosada.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/51442732141.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/genixitexizukabi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b5fc29903---gebegimijozinudekeguvowir.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/35686206140.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/2755318191.pdfIn PDF document text
    • https://bselink.com/userfiles/file/95843898793.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210905214605.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090521424897.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/t56f3o92vqksv7u278fad5dgcg/rugemuwiduluweloviz.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/57638689436.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/fogubisuwisim.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jikojuvetijogalujebano.pdfIn PDF document text
    • https://adikkedua.com/contents/files/85084152489.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/milomojariwejiku.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/82645235762.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/40661893652.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xapexaxuso.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3f500648023b961be7ea8d88f84c98af/18588829662.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/bevovomufu.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/71621532729.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210906092914_jis4gm.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/lunuxodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=plot+quadratic+equation+onlinePDF 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_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 18940 bytes
SHA-256: d87645e42a25208b04547b6b393367d785ba1efc4a0bac115d430afe12347e42
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 10440 bytes
SHA-256: a71e4936daea9673b450fc3ef962c3f44e5498e9c196faa1c5d91a26f2763910

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