Malicious PDF — malware analysis report

Static analysis result for SHA-256 25de1a56dab9e073…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 09:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f5085fb51ecdc5ef600873406f97676 SHA-1: fafe9cfc2eb2f976af7e830eb1fa4893c346e3ea SHA-256: 25de1a56dab9e0730e0829c1bea9db2d7b59e106cf57f0a9935e466e4a1d9339
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=kumu+latest+version+apk PDF link annotation
    • https://thaiwoodengames.com/files/upload/files/fefad.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/tumovokimi.pdfIn PDF document text
    • http://aquatherm-graz.at/files/33384403092.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/83772500268.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161376dc1de6c3---40099584227.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/kitizizapulewozi.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/xitudodebaweratevol.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d64584e9d49443736c243b51f813284/30186109314.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/bolirupuvek.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd90ec6e50---bepavekesavojovi.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/lalotiresifezi.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/pekorazupujusomesaxesati.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210906121443_rs8g3r.pdfIn PDF document text
    • http://alltechsro.cz/files/jukamu.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109070420246192.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/piselaluvumesox.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/38125048153.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/lajomuvosijig.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/goduwedowutizoruk.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69651b93148a211dbbeebdc5fe1b4d04/nevagukagi.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/70661575303.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gipakapukaviwote.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139448f620c4---lamikutaju.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/86697325911.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/7346329426.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10660 bytes
SHA-256: 9186d293976c708b9bc9a59c3624e7e1749bf458ce1bc7a1d7ccd73ca52fec7d
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 19508 bytes
SHA-256: 37a750da9ca621cf1cc0231a186e2621e063d1f3bb8dc104ba5ddffe3449c508
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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