Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fbe3091d1d8df5…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 08:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c5e064c441bef37c9e6c600b25d11ec1 SHA-1: 6adee99a14cd0721c2a83f29b77dc70dc180bb67 SHA-256: 54fbe3091d1d8df5479afe0279149fe2a004e3e91a5afd6d7bda692c1ce40a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress upload storage. The embedded URLs, such as http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832aae9a796---28851352473.pdf, are likely used to host or redirect to malicious content. The presence of PDF-specific heuristics suggests an attempt to exploit PDF viewers or deliver malicious content disguised as a PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ad206239---nudin.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22506c9b0e---93821230639.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5a2db17b4bce323ba0323946ee71e3d8/82225875612.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccee1a064---48848998949.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/r8ci26pfn9c4b0nptdds4m2ptv/78824938634.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832aae9a796---28851352473.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/217e3067086d27494898502ae4cf3b2d/25643897956.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/zuguvas.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4p5g8ojjej2qj7oma94igfglv1/14230396875.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/vazokojiv.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/62ccc85691af53d2183a7a2a75fd25f4/gamadoku.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/kafora.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gimowo.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/74rg2uclfr7026dij1mo659tsg/gulawamopetuguxidomobi.pdfIn PDF document text
    • https://ocw.tw/uploads/files/74689243410.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/gixibagapomigokaxi.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/82400669573.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pttk4usgfdtpm92oal1l183jg0/xikofega.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/141947467760aad1451f441.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/libevasof.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/fusudig.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085759b4755b---14060038998.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2f8md37dgijq9iad3qd3o1ohoa/gabuvupo.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/26966356224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+remove+phone+screen+lockPDF link annotation
    • 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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 17292 bytes
SHA-256: 029d004a4c3d4d4ead79bfdccd2dd19ae65b74881954140d92758504e1ce99d5
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E3 10620 bytes
SHA-256: a067bdb9742b8d2eec2b2de0a0423ab6c67093a7bf3e9ae6acaabb636fec486c

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