Malicious PDF — malware analysis report

Static analysis result for SHA-256 be35c88f3dad982e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 10:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96d7eef776ba60255bf637f9cd23e942 SHA-1: da03c23b75e1fe6ce45f3884bff6bf25ca8f1fb1 SHA-256: be35c88f3dad982ebb49637bca06377d0f1ff67e0efb23b07023438b2abac32a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to manipulate search results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16092edd42a1d9---xigubegutemizonewisa.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072220f233f9---29285332574.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-13/20210813083652695053.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xufizup.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/jupazirimunulituwifisu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a5437cef2b41ae6faf91df6128af23fd/zivaza.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/m7fc3b82l203t9t25cq0u2jdk3/jobezidebexedipebujo.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/78756521036.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7505643d5ba0f8bb32d6eea494510d13/36204920532.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fimodax.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/46824482473.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/55360202621.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/10953247843.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/72056382499.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/59hjtehbnajr6oddgfs789vm7c/34544403525.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085cb285d23---93324225608.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/49983104126.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/59734905043.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3713a09b---92153086852.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210727_CC445E2548B5DE9A.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/71021871862.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814a07407a1---34765258764.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7tfj0gnvn3ssd0dmpqpft0q185/663351549.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/kivowifikoguto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=clamping+force+calculation+pdfPDF 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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 10928 bytes
SHA-256: 11b442c857308533c439922898e00bfb1f650546051a0b8e896cd328a910fcda
font_02_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 18004 bytes
SHA-256: c9e0f0190462de2739392e32e718833c177160f40631c055288c7d348fd4a366

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