Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d524ece8a108f4…

MALICIOUS

PDF

74.8 KB Created: 2021-08-06 05:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01d1398e18d7ff308ac549bf5335dbd2 SHA-1: f1c51ef65d9283b4ae609aa1dad6c166732c7c8f SHA-256: 15d524ece8a108f479590dfa9c88e3b1c446efc4e18d2a9b234288fb4c41b640
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chcial.ru/uplcv?utm_term=ejercicios+complementarios+tercer+grado+bloque+3+contestado PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a737ad67312---xoninekozuxijudijoxutug.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/399495559.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/lusokaturefotiwovemoned.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818381177c8---kifegitifixakabogisinamo.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/37331174691.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210720_010649.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/41932896435.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/if6tr858k9vmkvf3dr3t245h3o/limenafotumizoworuzedajuk.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2fefb61007b69b6a509b2db8af44c82d/nokajitejixuzogikibidiwo.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/90040938910.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/potapefaxino.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c588c9bb---viwogapexunol.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pireres.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868439d875d---63281934108.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ef9164fd5---63085761981.pdfIn PDF document text
    • https://soechi.id/userfiles/file/wekotewep.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30abd065fa118eb7ae79915e1a5076f9/gojowijusovubez.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160991712af073---luxin.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/69237235615.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/jegusako.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608234dd2bab9---58962210442.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062105065770554.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/kidigogi.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_off0000bf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16680 bytes
SHA-256: 12aad3248f14d07b43fad804b645c2762a7753233f1e22192118ed89de8db95f
font_02_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 11528 bytes
SHA-256: 7e16506680cefa1eb4c1e1f7610ca89234c15258984354c9782c62826c3e3969

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