Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e66bf2700f8e103…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 07:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 458d74d33f5588580b56dc3d91ef5d02 SHA-1: b3010b1e67a1ca9d6c171ccc96874d4c9fdb8b72 SHA-256: 1e66bf2700f8e103cf7ec6e02321ef02e099591d2ee8e0fc74af3f1a020177cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nsdadventist.org/FCKData/file/vuvidunez.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee0ad3976---zivivotabiwakup.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/doxatowowoxixeti.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/74248990530.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079b006317---morulirini.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9f3f50895---doxonijikatejujunifesuw.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/30231067893.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/86847535975.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108061945065089.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kqnm8j169sjg6ik69o50h0si16/notoxufapotemokoboritenat.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2a89b35226bcf2c35161e04ef0de7bf8/dabuwusofebemu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ehoubbrk90asq8nc9ci8h4hrv7/gagikevenewo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/28548bdace617e50f66d00098c5ab144/riralopujebowemolalevoxi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160999f352be40---tegowokopanosoturoze.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k8l8u2fka36f0osom13v7vkp6m/18311933798.pdfIn PDF document text
    • http://praguetransfer.com/files/file/zuganamaz.pdfIn PDF document text
    • http://msiutilities.biz/documents/11709131765.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49295a9a3f---zotubonomenigawoxufagipir.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e3ad18976---dibedifukanivuxuri.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/navuvexesurunepor.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/60433303792.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/49145976630.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/bumaxubelimuminuserewirow.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ebef0b059077ef9371a108ff0390fbd/xepakadetoxuvisivi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083640a1d119---miperesazubabimobezebesap.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53dd02c9ec---9884550231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=textarten+deutsch+%C3%BCbersicht+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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 11048 bytes
SHA-256: 8db77ea91bc9e5f1eb09202bea3a67d7e3eda8da031284b83d24dcfe5d6d41a2
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 18032 bytes
SHA-256: d7a0ead17a63634d84fd95a79cf68f3f4cb6a7cf62dd6a6cc69ef8e4347ba0cf
font_02_sfnt_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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