Malicious PDF — malware analysis report

Static analysis result for SHA-256 6222027688fde5e3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 23:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 79ac97c50762c160286633aa1a530c91 SHA-1: 5c0b4557918c1790528c892398ef40b5b23faf0d SHA-256: 6222027688fde5e340a0042f022adb47b3232dc927103c13be518131f141f4d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=kimetsu+no+yaiba+full+movie+watch+online+free', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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=kimetsu+no+yaiba+full+movie+watch+online+free PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/avffrdnd25fgm0bttlulse4i3s/71789735461.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/92661580032.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/refuni.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/88279650227.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/jutibarusiwifetapa.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/zowuripatapikit.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/25808683912.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ganesug.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruriviladogevajupuzotew.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/78014496997.pdfIn PDF document text
    • http://drironcat.com/images/file/87726621065.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/gosamenaputosovagitodako.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/butevabatusu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1d8016518---62049844698.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/juxijaguzotejoxek.pdfIn PDF document text
    • https://parkettworld.com/upload/files/39250879208.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/dajusasodijijapuwere.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xesoguduvalaxexijobus.pdfIn PDF document text
    • http://hmed.vn/upload/files/17378759900.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614207fec458f---61594631490.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/tikekamitadasiwutifilit.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/litalewuximorizudinoxize.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/87495247779.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/83558715461.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/sexivakulaxagepixanukugis.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613de5b4242f0---7516623333.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/degedosemixaz.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_off0000b605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 11096 bytes
SHA-256: a7b1eb4b924545cf73e1b92d0c9fdaf09e6013802e51620b6040d8409681b275
font_01_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 15400 bytes
SHA-256: d0d5dcd38203e7488e0b8e534ba3e6bd1c7ca5cffe1820c267d28d3e15bef57f
font_02_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1