Malicious PDF — malware analysis report

Static analysis result for SHA-256 df773269c53c5a2f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 05:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01d69465d1792405359f4398bc12a774 SHA-1: a6b926d5009845200519fa34a9d268e587cfa3bd SHA-256: df773269c53c5a2f71a1a6ca8a81fbf19b2c2a9bfd26b3fbc502b8c923057732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://celyroknaterase.sk/editor_uploads/system/files/jezulovo.pdf In PDF document text
    • http://steinemann-ag.ru/88515340755.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/64587998403.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/69510044530.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608917c66993a---fekuzajan.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/14877480516.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f559b403b72595757dcb380fd83541f9/37615975417.pdfIn PDF document text
    • https://mmszke.hu/files/file/87845089729.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/75261923088.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/sigejovitigoraludit.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/fagulunodo.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/24543042920.pdfIn PDF document text
    • http://schokobrunnen.com/idata/90372623286.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/27065852710.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/67320567045.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/51790526644.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/sunasokukufafutawoze.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3505dc22e379482cadac03c5725d1be5/wilujutubuligazo.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/moxojifevipub.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572aca25f0---tozasete.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/futiweritopixazod.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/41aaaa6799c987cd8a754052a0e6ae3e/wogunomijox.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b928456da7d9340ef27fe9f2e40993b2/46950682676.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/baf32fc982ff21ae39f612ea2c2304ce/21344998225.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b78f32c157be2bbcf29418734acbf7fc/dudidaxulewazuxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=orthogonal+group+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cbfceb5d8efdf05e1bed88452acabebd/17175081848.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/wusalixudilirovekajuwavef.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_off0000b869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 10508 bytes
SHA-256: c881b0eabbbd4e445d4d7daa0fd8c3bf3ca56b1a8e4fbb77eb9248a2a63dbe59
font_02_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 15748 bytes
SHA-256: 02da7a58b7c32ad7b753f605546d91a141d1b98b876a04dd0c9594327ba7ab03

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