Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6e35e0dd160d5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 05:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e362baa1c1fb7e194d00637171411bf SHA-1: 911df5b0dbf4fc1545ad617bd0eb18b36b629db8 SHA-256: e3c6e35e0dd160d5821d86510f0fddded94455df2a6b21d2e72250c3854aa68b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=best+app+screen+mirroring+android PDF link annotation
    • http://modamoda.nl/uploads/pic_lib/file/17442920640.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/71160002396.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/93845692190.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/raregenin.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/67642992905.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/79466273792.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e261d95d---89941957294.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ea231b29e---xotofafa.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/32439814518.pdfIn PDF document text
    • http://ijfbn.com/editor_up/migatidutevozegezasijowe.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i79u1d5l1i0g8a49cmphnc0h6i/52655678602.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614e800da4a30---jofagona.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6efeca65---warowiduwalo.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/5594473025.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/bolazogilawixejonoparadu.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/ledosebigetitafukusawefi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/89122901425.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/61716937238.pdfIn PDF document text
    • http://kvrhousing.com/uploads/wopukomexizipofow.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/238c5932ec8062160a5d73dfbc7390f5/22218024005.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc865e16b---berafugo.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/pazopuwozoxarenujikep.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/lajarase.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_off0000b029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 15308 bytes
SHA-256: fa5f04b98e6b277d43e616714e13b244f84f0bb48b13f6a2e7b27a177ac6c379
font_02_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10864 bytes
SHA-256: 53309c64d4765cb2a009758cd058b89817f8b147ee29b7c66a698316ba0bf9f8

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