Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ebcf2b0e837c28…

MALICIOUS

PDF

74.8 KB Created: 2021-09-25 17:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 068b2f517d2913172d30703e86634110 SHA-1: eab0938487f194a5934786e961047c33da7c4239 SHA-256: d8ebcf2b0e837c28d6c0ba87086b564d5cf8d152e22d5920848a991eebd30384
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it's used to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=free+all+vpn+apk PDF link annotation
    • http://vako.vn/app/webroot/uploads/files/bapupil.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/88420069628.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/nawavifenugimujujodajax.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc2929d04---80882833342.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d524b727ba---zilivipevagerivudifudet.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/890ac70949c417f628bbdf0089190c55/lupiwifudud.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/tusukufewekudeserudujo.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/1926533205.pdfIn PDF document text
    • http://195exim.com/datas/files/gatixobi.pdfIn PDF document text
    • http://hasyo.net/files/file/nepemobimowovajewami.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5076e9a7---pofolebiximitopawazafaju.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/48019032731.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614de19a455d3---jutipodepetutu.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/temulopufosawagif.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a013ef01c---netuminaso.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/demiwura.pdfIn PDF document text
    • https://rrhh.fronteraliving.com/imagenes/contenidos/files/lemidunegekimadateravuxe.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a40eff2dc79572a030d2fe3a8a221fb5/mibinuw.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/76021515601.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/88326609195.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/365b57c96f1dc80d51057e61d2cf7d31/kufes.pdfIn PDF document text
    • http://lovesenergy.com/file/14407382316.pdfIn PDF document text
    • http://vitrine-prof.com/files/rikepimajomegexe.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/jigelebomexejimowiw.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/sovolajeguzakofojav.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/82505691624.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_off0000bd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD92 19416 bytes
SHA-256: 5c210de03dbb85ac05ab60021dd303764bb3d99a08d5bc93974a8023cdf84283
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 9900 bytes
SHA-256: 57bd5f83bab08ae0f4b2d7ac4a64b469369e2d878261cf005c70ae04b26da3ad

Open this report in the interactive analyzer, or submit your own file for analysis.