Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6881f3af877d40…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 06:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea2e087cde3dc642865a199e1cf14901 SHA-1: 46dd32c406a63cca44145eec87eab4d3f5bf477f SHA-256: bb6881f3af877d40ddb2798fe32120189ff0ce6c2dce5445cc0a1746a1e8cecd
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 and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=2015+nissan+versa+manual+transmission+for+sale PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mhmocsjl2ueru8n65scsdqfab1/bofidipipafabozus.pdfIn PDF document text
    • http://ropesadventure.com/d/files/18926195742.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/53358033071.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210819_133009.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///jaral.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c8191b2a---kegapi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/65758812225.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/64346503798.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/dbecd39c67e50ccf300712a262df65a1/putenoruverixuxopaguxo.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lirolasowemamamorusoxef.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/81869752384.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6be830c391---48738610912.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077f745c987b---bobetiripepujunurijip.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7la8o3r9dk3ro9nl4j5gslm6c0/52054867077.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/pevuvusaxafamowabisilajam.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cf74bfa0987e54432296ad0122c23139/42433756081.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/2724984142.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nibanonij.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/fojexipekitexuvuxujow.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tazazivun.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/rorati.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845ff27e66---fusarenafozigevuji.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/20551890277.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5fe14c0bfa259c32702d20088bc09cd5/nudenerenexumupo.pdfIn PDF document text
    • https://latework.cz/soubory/77263906461.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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 10872 bytes
SHA-256: 1f0f06811ecc1e24448eb7f98e8cdcca7f5e5d9ae842ff93be8986d49ae9fb9e
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 19048 bytes
SHA-256: 7da4630a08de434233bda47e607718265ef48e04f2699d58a669e0355b20bf91
font_02_sfnt_off000141b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1