Malicious PDF — malware analysis report

Static analysis result for SHA-256 70eba5e045980658…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 23:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ab6d4b9c8a47d16588887312d350a97 SHA-1: 71d81206d992a1c403326037b5d7f58278652bdc SHA-256: 70eba5e0459806580fdabeb20af1bbd2230c2833c5453be23ccb2210aa9feb85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=can+i+recover+permanently+deleted+photos+from+my+phone PDF link annotation
    • http://dobre-jaja.com/Upload/file/30643523911.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18095908399.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/81693759968.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae5f5c244---86027445915.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/boxeluvawegaf.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/93905004404.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jjbtg09f70cqi3r321mh62s9dt/26868171153.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/62323320945.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/78319287837.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/32107696899.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/20506391979.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/lagamuwof.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/besanon.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kekubasifeweto.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6addafe22ce795450f45af8f78a949f6/xupozuraguwexulebola.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nurutamu.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vuwipubivuzavasokoje.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/79726415170.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904040350.pdfIn PDF document text
    • https://maisonforville.be/documents/file/73793957465.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8aeb9d4fa---pawerirudagidizezanurizor.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/058c5396a7ea2bb3565d9fda9c958a68/jatasojewudadaxetuw.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3decd0406---rulatudasepuvazowekape.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/fomobevap.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/95721567553.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/38339245866.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 17828 bytes
SHA-256: 007b0b4e33f29e266bdd7d7a9bfc4753adace2b0d17f82b807f7d13cd64b0bf9
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 11096 bytes
SHA-256: ed3c1ba9f95e9230e5d2942286c566de624badca7c71b7b5e15b9cef403a6c3b

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