Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6ad77b1c8dc146…

MALICIOUS

PDF

159.3 KB Created: 2021-07-16 09:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76202109d684caf3c38bdb575b8d0e1b SHA-1: 7b6f9a0e9f3624a66cb48d786fd0f150f1b42a8a SHA-256: dd6ad77b1c8dc1469a77df8cb21603e212021d0010975101cdd0edacd2aba87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce68b85706---45598606696.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/oe1j2phprdcf60291nr0666ktp/nawogelijo.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/xifaboritog.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/degokizuniralejakijigin.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/mv03kjrotv58orjmvjm0rfuta3/norevobusezez.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/241394051.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ccdb8ecabb96dc091827e134d5a954bd/kimamewenidarozaji.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/93766433713.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/pibobito.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mikonalanigimaxikal.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/77a39nlfhicgop02rg3rn0l7eq/xubida.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/phepmplhre7hmtife0tha7aodm/bojezaginetisi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77717721677.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/dugesenidemirefanapuli.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/pevalukuximatunobe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0ee34aeb1---13511722459.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7048529bc1e5f27b6e134503d1d3753a/wuxofaxezuxadogofen.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gg3dl1dui7i63egl9s4p3h6rvi/fosafejefegebarime.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/filewevijexusesujig.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/diwezopu.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/98172703684.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8qvu6lsp3koela7etgoej99p4q/31621576579.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wamebas.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c93965813---jopojaxerapejesil.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad997ba64be---pumiduwujiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=second+epistle+to+the+thessaloniansPDF 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_off0001fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21461 10584 bytes
SHA-256: 820e6d804a90fe74f0e7d6babb6d89da9e14c612c1fd380c5b2a81d116ae3ac2
font_02_sfnt_off00022c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C72 29416 bytes
SHA-256: 22f666330a8b7e517d082f80d5d56a36b0703e73b403700be7ee8c177b4cf3cd

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