Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb65f85c9ebe950…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 18:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bee00c4db066f633280ea64020266d6 SHA-1: a1959a763989b66f9584e497321c44a130a67962 SHA-256: 7eb65f85c9ebe9500e0e5f1fe73e7a13519627cf0493225a03e78ce7933e9731
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with a high ML score and ClamAV detection. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting an intent to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=worksheet+30+properties+of+acids+and+bases+topic+8 PDF link annotation
    • http://formpart.com/upload/ckfinder/files/40361312362.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9ed2d0e3---82085326672.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tixemenuxisejitoz.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/jemetoromutumolewabiturab.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///42920522362.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/e53djqphqtjrffra6316p31lm4/91198719710.pdfIn PDF document text
    • http://khocabien.com/uploads/files/83108386634.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/01a1957ef841dbf8b887db46aded8cf0/jaguw.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/99849123738.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/82607395499.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ea0a4ff01---mizezu.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/7115000096.pdfIn PDF document text
    • https://advik.net/userfiles/file/wadanurepusireniwe.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210801100208.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0c0593888e7863085b26c980440f1597/banovukirufelanadono.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/26390244844.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c802b7a5---66778965195.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/fexolaj.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16094bcdf51a30---49276223295.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a287162cc76---2764747767.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bewivapazaramonekud.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/103626d2d6b9759287cb865ea9ce9ba4/ratizukaruligigoru.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/sezafetusitatap.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/53766437262.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_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 11396 bytes
SHA-256: a4855980fba2ce30f0814b253693f2240d9ae3d9a553495469dd1a996dfe9a68
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 17184 bytes
SHA-256: bd96de8b5bb7efc2140daa8425f8cd52dc8a41abc3c364ba735ee8194829669b

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