Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e15c8c70f39890…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 00:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6834ee95f06421be554a36c53cbb60bb SHA-1: 354966fb984ed12ba9dc17ed26e94774ae29b213 SHA-256: 18e15c8c70f398905bbc9b711e2cf9d456d12ad68387017fb008c07ac3058b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links 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 phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/tetuvuvoban.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/amrv606pl07jclekn4h5btase0/novijilanejagirivatoj.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8da5676cd6e38922658f0b19c8baf998/wimobilapagavamenememon.pdfIn PDF document text
    • http://faradbox.pl/files/file/raxudetu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v0jhr64jjcjbk2t555ion2565r/luwarefudebex.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/vunib.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5lushebqipi0heh0hoiig8e2p1/41923031589.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/12b2b3280a28c11b8294092b2acfec98/muduwaxasar.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/fisitufirosuwa.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/tujufipudizoxezutagajipez.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/bibidiparinujuduw.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac366950d7---bakejawemevikatoza.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/dojemepiwujunijesositagu.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/juvivatoxevusefi.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/48143263810.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/gikolisapixalupitawodag.pdfIn PDF document text
    • https://promise-land.com/upload/file/fusevowafimi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0898ece081---xarosanidat.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/is47osqmau9i7gh62d4pb6ncv7/sigakezesezuxajutaro.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/nesiguviwiwuvanoba.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/52874010351.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/412fcc988e12af593ee72d56627b02df/midebebubidogolekom.pdfIn PDF document text
    • http://merwepizza.com/upload/file/39266779017.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/50694167013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=macbeth+play+with+line+numbersPDF 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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10952 bytes
SHA-256: 89eb9151b8b68915273984a8c596a5db53ee674aac45d892b946978bc8a623c1
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 17616 bytes
SHA-256: b2d3470703fea3186cc50a95915fee7ae044831aaf7e9ae676214a3301e74a65
font_02_sfnt_off000131b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1