Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6aba51265119e9…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 08:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f627f5d6db429d5f27b66d8ea2f27bd SHA-1: 192c796dcf653bc826e66d091de4eeab523a6bb9 SHA-256: 6e6aba51265119e9d6ac0311d28532f259e79a74751a371bef9aa64b9965a670
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure, potentially redirecting users to phishing pages or initiating further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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.
  • 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://coretry.ru/uplcv?utm_term=bionaire+humidifier+manual+bcm658 PDF link annotation
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613214bbb6e6f---41873161291.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/xorenifexeniseledanogorig.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/95350162153.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/86852966870.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/ninujopetexoraz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af871ec56---84069520816.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/97554148396.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/61126433001.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/lidebefedowu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6a2eb7fa6---86446503842.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/kexaxenur.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d70f455058---revajigakejeratupugun.pdfIn PDF document text
    • https://bauarch.bg/files/53974237598.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/41119835454.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/59090620159.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9f22280e---paruki.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a0d1e2febcd1dd3a40aa28de5e973f7b/92362327283.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56982dff0---delorewig.pdfIn PDF document text
    • https://ekransamara.ru/files/19067517438.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/98268706009.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/luwugenimavifutotezikut.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/fiwubewokilonapu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210601080014_1351879134.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/60945428233.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/16853082208.pdfIn PDF document text
    • https://bio86.net/fichiers/vusopavixapemone.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_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 17984 bytes
SHA-256: 6fd9bcf1b19274ce383e3cca2d4bc407b5cef0a85d8ebf3241a1781c8669be49
font_02_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 11280 bytes
SHA-256: 372b724b61a9137c82661a3131835b875b73be5d67072c3acdf90b8a9d6c41b4

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