Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da9b3eff76d6c76…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 01:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82764926056d78b61e20ab8438ec01cc SHA-1: c21d28d3e1adbc73d56fc1b5d42b996d01302314 SHA-256: 0da9b3eff76d6c7656d81244e8866518f5f002fa045a704aae113a25bcb5fa6b
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload directories, suggesting it's designed to deliver a malicious payload. The presence of a 'download button' heuristic further supports a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=chrome+apk+jelly+bean PDF link annotation
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/posufopemefapuzarif.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/29163107678.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbc4d86f0---daxuref.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gelugitaloretafutitojitu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8e942588d366d4bcdafcb6e5549f3d15/82639200733.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/faxivos.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/desufekunuboruveweriwofaj.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161404674943f2---75970110026.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/valafazikodefelumevuri.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/kezobefox.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/22280875806.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/22270308178.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/dirajumajudumikedenimifa.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/rujorabesakutaponowogiwi.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210912051531.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/26148292275.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vekugafurizujukosijil.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/rerunibuzan.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7360a421d---48659675048.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/milejabufazijero.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/93582966380.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/rugafebajeju.pdfIn PDF document text
    • 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_off0000c12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 17380 bytes
SHA-256: f2fe9081a0a50a9fa346c6046e66c67695fa8bf5f0d3cc5e610bdee279314e0e
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10668 bytes
SHA-256: b1a6a95158fcadba783686189485f7f8a821d391cbe5f5246e4f6641ef314764
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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