Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97462ee45000e37…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 01:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e65c683a02bc4f0a29b6d65f077ed1d2 SHA-1: 3b444cf95273c80a1bf06dad6d46423c6ce14b8e SHA-256: c97462ee45000e37830395ff5bc2df07e5895786057bcff9318f6b8b968616bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=to+be+a+good+mother
    • https://avonsteel.com/UserFiles/file/35958578744.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521031339729463.pdf
    • http://c-amc.com/upload/files/fubuderusena.pdf
    • http://yangpupark.com/uploadfile/files/2405209179.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2242d9fbc---zulaxagedud.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfeb91a37a---73681461682.pdf
    • http://innovad-ltd.com/userfiles/file/72671115099.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc37d34b1c4---92441154432.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/00a8ttibv9tb6na7iliknnjfa6/nateme.pdf
    • http://www.bluewhaleline.com/image/upload/File/16303379260.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/66nutvig7k4u7fiq29e8k7dmdn/64478179888.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50ef35dad---jafaperogadotepise.pdf
    • http://georgekoldun.com/var/upload/file/79971301666.pdf
    • http://haphadoor.com/upload/files/wituzosuvesobotugozak.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/33228005175.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b40878337db---74447726274.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/96575811787.pdf
    • http://classicalgardenstatues.com/uplds/file/20498542498.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/131163275.pdf
    • http://ltptech.vn/uploads/userfiles/file/17988544788.pdf
    • http://lab4050.com/upload/editor/file/25924711068.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d1a00f7c0711ef04967e0d28a760c4e9/96235100092.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc2b14008---24992834571.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 16792 bytes
font_01_sfnt_off0000fed8.bin
a4f6f4a46db1dccb2369219de9d157415b30cc7a062d3f633160aaf4e70e88da
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 17132 bytes
font_02_sfnt_off00012b6f.bin
ab5d369de2224cf4dbbee1b59bf21b2aa7f1eb6f99ba4bf6684a2cc748a1fc77
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 10388 bytes