Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e2f3d15e647d5a…

MALICIOUS

PDF

95.7 KB Created: 2021-09-08 02:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3821c6ba741b1db5ca1d583dcb5ba962 SHA-1: 3628ff591679cd5885c9b768a240b54bbc185e24 SHA-256: b8e2f3d15e647d5a72df3c9a5c8d8adc22e3472498636082daeb039ec325b47c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for hosting malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick users into clicking these links, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/88613676931.pdf In PDF document text
    • https://cafemocion.com/userfiles/file/16015399529.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ab52b07a---35626702880.pdfIn PDF document text
    • http://kgmda.com/upload/files/65167247407.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/watajusuniguwala.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906131727.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/37189270708.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e21193184---potamonikufefe.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4p0cltq47gm6gr2vrgo6glg03c/8361787236.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/xowafekefunafevelaj.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/d778b46kgp20c7v3n7udas6md2/goxarafigelixiwibok.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/15056360824.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/ronemewazuwa.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/ruwofuvinuwasovak.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210831174217_jggful.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wimewekimanexagatexi.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mulidifowigamukutivarovo.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/xanusuwefebotuvawafet.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3a44db55ecd945608882508c590ea22a/86897495655.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/vuwuge.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b7e96fae412627842088f0f78e7848a9/baniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=red+cross+instructor+network+worksheetsPDF 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_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10584 bytes
SHA-256: 28035b9ac5143ebaf6ec6219347e47711e17863b79d66a7b4a3df7e275643a24
font_01_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 19288 bytes
SHA-256: 3c1f11e6c4f71b40f1aba416a3a63c351b598b39d0edce3170e4ce065b4d6be4
font_02_sfnt_off00015763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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