Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb8f8602ba46a1d…

MALICIOUS

PDF

84.4 KB Created: 2021-08-13 23:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c98f2b527118fba3bea6d533d2aa5a2 SHA-1: 0aa2c2bc90eec05eb3800544ebc00c83da947149 SHA-256: ecb8f8602ba46a1de84195aff5a79add0109149290cb082c19fbeb30ebe1766b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=fnaf+the+twisted+ones+full+book+pdf+free PDF link annotation
    • http://www.wiz-fac.com/uploadImg/file/87507505991.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/poruvakaxogetowegolafanod.pdfIn PDF document text
    • http://sns.hu/_user/file/92307658186.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d98eef56e55---36202281537.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607637b0d20d6---xepirojorediwugesipudisa.pdfIn PDF document text
    • http://tai-group.com/upload/files/kaxogiga.pdfIn PDF document text
    • http://ausafe.net/images/art/files/69326150684.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610b27bf7e995---mogopuriwuroj.pdfIn PDF document text
    • https://epiphanych.com/images/file/xepapejolusemif.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fde43550db465fd45dfbf24228a81b5c/83907240726.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65b08010e---vifukalanezimapivagag.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/zopevew.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/abe20f423edf10a456d41b9028577b45/911415659.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/giwimarododidizalano.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c2daafe3e---89930473365.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/jowipa.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/46831403443.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/90d0642eb71c50198e642d45b2f79816/71615919765.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ab301925fca158ca9fc83be9fc3a1f47/96009679033.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/lexod.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/gezipaded.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/tijapi.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/44326110094.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/womuvokenusojun.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/wiwamup.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 16768 bytes
SHA-256: bdcd492b12729041647701345d33e5a37341decbe2f0b3dbf69d474f090edb45
font_01_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 10992 bytes
SHA-256: d3088b7b0be9ff5e8611d4d41434045451933a44db35eb9bb8795dabe59834bb

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