Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46fb5c5d36e7f90…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 11:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0f6bcb681af5ea9c29b1558592604489 SHA-1: 0cbb962a11dd6ac674be10017c7358443a985426 SHA-256: e46fb5c5d36e7f90f88e7957ff615ad2c6d2c9340f0cdf383a3d9273c9f44640
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it uses social engineering lures, specifically a 'Browser extension / update installation lure' and a 'Password-protected archive handoff', suggesting it aims to deceive the user into executing a payload. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of numerous unknown URLs and link farms points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://playbabydoll.com/userfiles/file/kuvoponuloxuferatita.pdf In PDF document text
    • http://salkim.com/userfiles/file/91698051670.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c76899f6a---39364081580.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/91596508388.pdfIn PDF document text
    • http://live-net.it/file/lovajadowifidokarujebi.pdfIn PDF document text
    • http://abworder.com/uploads/files/dekejumolo.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/120120234779.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/13446419244.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/9095540e877d12416780b298507079e7/vizakemazujobanux.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1683872155612fef3d225bc.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/40186025054.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab247986c8d---novage.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/nakabel.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/45445940043.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-05/c0864b627aed0ba77977d78a4dfe1dc5.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/90644075723.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/28842490568.pdfIn PDF document text
    • http://splogservice.ru/content/file/litezobanuwi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6etims263jr82sehphi3oon8h7/57004181042.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0vh6kr16j6i6rhhl5kgbvk2iq1/7437779163.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073df80aaffb---8651658282.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/ratufomokaginemesu.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a543e392f5804d3c838e58ba39f45135/livojisari.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/57577208752.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/68134512563.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fa7214fd---nekogokunemexak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+png+to+pdf+high+resolutionPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 18444 bytes
SHA-256: d0302a9d9bf4bf640aacaec634330aeeb0a28a65fc44c80161194fa3c0715ff8
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 10812 bytes
SHA-256: d0e40879560a6e154df0d7145b8d8b0840c68780b0b0c3475a22e6fd1b5b90e3

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