Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e77f287d46a60cf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 01:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 172da1b4ea56b6df1bef4610156855e1 SHA-1: 1e1b7c399eae9391d8c315651d9cf7934012bc04 SHA-256: 1e77f287d46a60cf9000941d12fc0943d8ec97f1ee98dba808e0c187d2eeef11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and is identified as a link farm, with multiple URLs pointing to potentially compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://mackyz7automotive.com/js/upload/files/favutorusapetalukewuxez.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2qkj4df3fg8a4v57dged028mna/tonorura.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/22561335583.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/11042067689.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/4005338134.pdfIn PDF document text
    • http://artospace.com/pics/file/11745291774.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609104ac1c7a3---gedofapubedejaxu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4adf39a60f503021b310e59d368f102b/64005375434.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/67961982714.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/pibazomuvo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ce544206---63131619535.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/donapisadodizalam.pdfIn PDF document text
    • http://apsons.eu/files/file/mobuju.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ma04n05co0jjbldgjjekcqcsfs/29914373192.pdfIn PDF document text
    • http://www.ezmoving.com/file/70827819198.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/kapijaxi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b14cf562aa390af8bfa56f43182d58ba/25727682818.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d93cce8e1c28be466561a5aca8225a53/gatajawosasaraz.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/78740196018.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/xelonipewenagopopusoti.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/69852253857.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/judinariviwizeku.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/24724168979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=information+system+theory+pdfPDF link annotation
    • 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 16020 bytes
SHA-256: eafb78b2a95f9da2a7507ca733173cdcf6162a9e78d3a1822b6b72e6572d2bf1
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 10780 bytes
SHA-256: 7af23131fc9e100c5c6bfbc7f32023943f6f9d045e3fcb0cb54dc67c02cebab0

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