Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55d10c1dea29b53…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 14:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f45ce686414f8a7998104186154bc2a SHA-1: 11da22771c2ce613319ddc53977ae8394285d381 SHA-256: c55d10c1dea29b533e51800a93c08812925efebdb6a4be98afbe5adfdbfd72cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, containing numerous links to external resources, many of which point to compromised CMS upload directories. The presence of multiple PDF files hosted on these compromised sites suggests an attempt to lure users to malicious content or 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://atamergranit.com/userfiles/file/66174012290.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/99mi5tifuauc21a5o2d8cp9i24/zedapenewalefumekizasor.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7f796ec6---lenobibuvovizelejenubaje.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/55ae21113d1ecc5ba450ad277f14a808/71703005554.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/luxafimumekuputikugam.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375190d7d07---janekanu.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/todola.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/93979339193.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/nukojifuleratuka.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/piferesijatako.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zuwoxifusebebu.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/gogudipugu.pdfIn PDF document text
    • http://saaretravel.ee/images/file/62268063456.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/raselekuzufisoxuri.pdfIn PDF document text
    • https://securitydm.com/slicice/file/99162822416.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f892c30a4e127c846308f63f7bb0f510/53122459786.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/peretunolive.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zoraxodazujaf.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/69621624399.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/domutowusu.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/47388574961.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/42262974243.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/69904313198.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/bojibunimizodovewojujosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=watch+big+brother+season+21+online+freePDF 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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 10920 bytes
SHA-256: bd1b43a395a300a7cd34f3253db9141c0113fb79a9ef545931e68b7eba2c3601
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 16852 bytes
SHA-256: 193dae23d73e88bda900c801dfaa51741c8564e45380e6cf9cc7c0325061bfd1
font_02_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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