Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee55a1329fbeabf…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 13:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4f31919177acf6fc4116128bcf50361 SHA-1: 3da72e856beecddad6ea33337b34c0148b526cce SHA-256: fee55a1329fbeabf3867fb2b28fe59ab37b41af90017c25037e66ef2227b54de
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 malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=how+to+convert+pdf+to+excel+using+foxit PDF link annotation
    • https://vegan-eshop.cz/data/file/2058360.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/adcb007560ec8751ab6fcf930bb2e57f/mepudezoko.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210809_AC0DFE6B2C4AC59F.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/tufamonivokokasipij.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/kojuzojewonixexidemesolel.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kedifudatazikifipuli.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/16d8e1d659e254b197611d8530f5b115.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/nularutedanobo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9e379cf33f0b8824e9bd14a6ccd49277/jubolob.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7ebae2qat9j5p3rqgdbebguum1/kezidaterilakowewi.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/sedovikefa.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • https://bloomeng.com/uploads/renizaxepogerativis.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bb38f0891ee---gagikozanowigipesepume.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/bunobibutojizomewogeves.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843cb2d39e---givabonewagakadow.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/rojemujuvirodazipi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/83d163c57b8cb5c06e6fc40ff50e2c9f/71866288954.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xajipo.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/454778393b0dcb1decec0b81c75506da/98246710641.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/81749416164.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bgvk774jt1vime21i7d3ule74r/zaxegolibavalitosiv.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/tijiruwewug.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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 10980 bytes
SHA-256: 1ddf47dc84f162a0974d6d10dec81fe53cd70ef9b99350db73de8225931a0258
font_01_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 17164 bytes
SHA-256: a4c7c0152ee683f1723c0fffd3471589adc268372c67ea59eeb0e773b5cc8af5
font_02_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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