Malicious PDF — malware analysis report

Static analysis result for SHA-256 d318bcb31e2bb989…

MALICIOUS

PDF

67.6 KB Created: 2021-09-07 17:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e38fb027bb99f449d8e8d49c9cf152a9 SHA-1: f8ca48b299567ea9fa3c6d592bb03e8f71d54d75 SHA-256: d318bcb31e2bb9898ec5274d833c1a048d0f8b48caee7a42a8e5cbb55d908a8c
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, many of which point to compromised CMS uploads or disposable hosting. The primary attack pattern involves directing users to external URLs that likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://eltonltd.ru/sites/default/files/uploads/52307805539.pdf In PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608298d0c18e3---guduvo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ffcb166f---sifewusoposimekizozanu.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/piriloru.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919700e7606---sanomu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/99664590235.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85bd18c055---53428272455.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/86436621716.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/jexerosimifikarimivame.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/garutabuvunadagukewuko.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9c16e88f---73756568694.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/66327265649.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/84123351827.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/605f1htfg0viilnc2ganu08b92/93282935434.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/54487fcd79a25426a424a19f23f583c1/sowogarus.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/vufogozikemafate.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/5865898963.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f335a5f89---moleboz.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/17839956064.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/newubekifedapukukofixim.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/39595960227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=reward+system+for+employees+and+motivation+pdfPDF 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_off0000ad81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC593 13840 bytes
SHA-256: 4cae0561940b2c47f332cc989150698c2983d703801166f002d3ec56bd8c338e
font_02_sfnt_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 10968 bytes
SHA-256: e5f8236c267a5c5b6fb7bc923f00d9b93abe83bf091655531cc756f0680ef253

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