Malicious PDF — malware analysis report

Static analysis result for SHA-256 9261f2bddfaadad5…

MALICIOUS

PDF

97.2 KB Created: 2021-09-22 23:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80b9f6c410634f378b78a51f84531638 SHA-1: 247eee443eaa238755ab3afb7dc97a7e35dc27d8 SHA-256: 9261f2bddfaadad5e3a89efc3279a2c36702a9be3515c262a7118cf2f13ef865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs, such as 'https://queure.ru/uplcv?utm_term=gta+san+andreas+cleo+android'. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing strongly suggest the document's primary purpose is to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://queure.ru/uplcv?utm_term=gta+san+andreas+cleo+android PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cbcf876808f6577f12f9b587589cfe20/76002633887.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f1852a99be96e75a37444358194af33c/rinawalideto.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614649d543ad9---70532963394.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/verumasadagifexekiroke.pdfIn PDF document text
    • http://domexpo.ru/up/file/48874079752.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613132b571f83---16913820501.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wugupiv.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/47981277651.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/pukenokijadobad.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/fimiderisebogagum.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ffa849e4c0793f59637b0abfc4ce56f0/42840106302.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/busenovexa.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/77114420368.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614557f82489d---bumav.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/47714890637.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138edc900f24---munuteforativukari.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///15147121665.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/80468459080.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/mefipo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131c17020f22---miwajaludu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/nudanisimuxesana.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/rumudesomora.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/supuxomex.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/sereranefalejegutivitopiz.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3706dcf3---43723196488.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/72753846133.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_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 18288 bytes
SHA-256: 3c788372c4566052db995626c840bd639de6cd885e42146c02afda0e6e34550b
font_02_sfnt_off00015f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F98 10404 bytes
SHA-256: b80aa80c3fc4976cd3bafb87f4f27922db902ed74f0cd459d443ebacdb3c1102

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