Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3087736191a5702…

MALICIOUS

PDF

77.0 KB Created: 2021-09-21 23:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c11d05560a95cd29f99e6d3e376635f0 SHA-1: 4ef7723ab090aa92408f0209fd5f92d8c2a0ad53 SHA-256: b3087736191a570280325ebaceec21012e04d2426701b18fc571ff4737ade168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://tonthephunglan.vn/upload/files/nejifinigiwuz.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/46981045364.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gezamimevenemebigidegas.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/15684690373.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/gafomavezawiremovaketixir.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/lamotemazakeluzuv.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/c26fp5on0n91gkv03p4avjenie/92357561490.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/vaxokadipukimikoban.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee44bb9cec---89799412624.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/pawijuna.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9e98fe63---47118078097.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210918134338.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/7941840140.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/majikesaf.pdfIn PDF document text
    • https://ienter.bg/files/64294191048.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/53113654055.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/barivarikakavip.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/xorukuvezebowepo.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/jebagaj.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/47273872805.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/84120994965.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/97051382751.pdfIn PDF document text
    • http://haki.vn/uploads/files/50275105161.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/tejiruneda.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1109cf8a1adb07feab0f675543e8d0ec/8189549277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+put+background+image+in+android+studioPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/dogaxolopi.pdfIn PDF document text
    • 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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 11220 bytes
SHA-256: 3789ba38977e260dc58a8b05a80bf6264dce14d8290665835069951ca36accf9
font_02_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 17420 bytes
SHA-256: 7527ee8cd10cb5f4cee6fb988b0f473352588508a0f548c1cd5cafd812a06a17

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