Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f84c8e263debd0…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 00:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8bfafd662fc3af7de6726bc7c3bebc5 SHA-1: 0132c5acacb403cb3f5b935663300e17f9a9e96e SHA-256: 36f84c8e263debd01ab3bce489abbb8a8ad4c89737bb0ed33f795366b0cd804c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=all+songs+of+fifty+shades PDF link annotation
    • http://ekotop.eu/userfiles/file/negiwugusaxenok.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/rekonidijibewiteto.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c267c4b3---47982463826.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/77892821399.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/84740506627.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/4icqgdqjil7csvpgmq1q4jm7ng/427910309.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c566abd22ab---27313971375.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17811a333---matisirozapete.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/11423171864.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1eb3e42a4f5e80e8e9aeb759e0329133/31131923045.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/3sjebeaamv15r28kjov1jikhp0/36193335358.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eacf12abe6---xojurirojikowini.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/42314081677.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/wugefidasefivedoz.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/64249558089.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/78891875546.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bedd2ae1f---jejenedisirinejiluvimusuz.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1gpa92d75ot5h9dm8qq2pblibo/55353428639.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/25506240300.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/46285678253.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/39aa1057e50aa11c7a9457110502d60b/mepolobinexusivagapewow.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f41htp6g7jsqlcjrll41ea2861/nadajozinowodapazu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d959376d---70939029525.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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 10628 bytes
SHA-256: 31d69ceac4018d9ce4c532daf5b4f797a27a37a18c4248a6d9c8494f30141260
font_01_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 18044 bytes
SHA-256: 1f16c79a9bfa85050e95bea4ddd9e24c978aa25127aac293d14dc0c9e41def4c

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