Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b6d1e203408657…

MALICIOUS

PDF

98.2 KB Created: 2021-09-14 09:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc51e3d383c2ba5adb0d5e3ba124a73f SHA-1: 1521cc70d749b7947d2989cbb2114cc117c9a215 SHA-256: 90b6d1e2034086577ac34c082b4f9c4c1a4de08c2c84a71ad7999998eccc0f0f
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple links pointing to potentially compromised websites or disposable hosting, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://oris-am.com/editor_up/zipabudonipuwidoz.pdf In PDF document text
    • http://craft-personal.de/userfiles/file/26880550346.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/futurofoxifonabusumifujij.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/bigimupujus.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109111338208130.pdfIn PDF document text
    • http://uhorder.com/upload/files/72118180286.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/32603444974.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e5128eb02b51a0eb6c6bca169963da76/27668369526.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/jabugedisi.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/pugejivavagolojato.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/webeganoliw.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/97423312001.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/66768047608.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wolejerenuvukife.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/41727762916.pdfIn PDF document text
    • http://generoussecurity.com/uploads/27281236084.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a1975a5f4417d2e188e0ffe45390214f/24261395947.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/82dee2deb20ae94b3bba699fc1b84721/xuxinetumigal.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/xufuw.pdfIn PDF document text
    • https://wecareprogram.org/images/file/87106478280.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/36627255584.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/47201317521.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cfa6d28b5548c70b30db011ae54c67f/kisoluve.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa78f2a23---sadedapelivekugurin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bonifacio+global+city+zip+codePDF 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_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 10896 bytes
SHA-256: 022a159ac7c86859c6d9b7e275a62f058f913efeb3f4f60fb6655e03453268d3
font_01_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 17800 bytes
SHA-256: e208ceb261b9db0cb46d13837e1bcb76462c27fffc3afeaf6e7f9bfa69985b7b
font_02_sfnt_off000162ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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