Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd403bbbe75154…

MALICIOUS

PDF

84.5 KB Created: 2021-07-13 19:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2e02917848eaf40ad5f51edd61c9d8a SHA-1: 1e7b60baed38b5961bc9a3e5c45555662de15fe1 SHA-256: 55bd403bbbe7515450b71e699837c494790081f0e7f4bded8fa6ac1c12ddddca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF or related content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40bace47f---rubowevixemem.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5q50k0t2aqbkbi4u3ph6e709oe/51834265524.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/50454908948.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2b372e06661305eacbb32bd33df93dd/25167014453.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963da7bfa99---xojetamat.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/90122578182.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/19591896235.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/9673090298.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf5f3daf9---wulemubopesiwenuv.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/92007472949.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/25197661995.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/64884478249.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1a13bd97---98471379164.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33e409132---51524663164.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/11266954106.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d5e921752---jibebokulib.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/jiwexipod.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/febasopalejosixirusi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f295bc96ac---pixupitotuzivadesituso.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/37720947428.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/71262817389.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609073450f6e7---gakiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+file+greater+than+100+kbPDF 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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 10752 bytes
SHA-256: f6dc9164a7a973a4cc252ce396129804bb2095cf50e31d38a52134fb315797f5
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 17128 bytes
SHA-256: 321e53f6ce309c61bfd18e4ff5fe7bedd0a4157ffdcf7f65044564d0f54415b9
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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