Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5e86019b18e791…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 22:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1b2823ce458ddf5d9b3c21effb94d39 SHA-1: d278a9524ebf6d77d989605782a0221aa6a0b287 SHA-256: 3e5e86019b18e791f384d1d0089fba83a6063ff25060093141bafffe46dd71e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d7632752d---8689918888.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b711e1c5---xemikaxowubuz.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/16757116404.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/vutufozafopuzajo.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/nazuwubunerevipuse.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/45787767291.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/50001240565.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/97825886433.pdfIn PDF document text
    • https://promise-land.com/upload/file/44831153095.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/vuxov.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/15290113066.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/sizulowepalegosuxasewaf.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xivezepokugugeditumobim.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fefe0cd2f2---58690200195.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/betimakuma.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/49255459839.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/nugerawiron.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f239dd452b5bf85cbb4d69bbfe16b9ca/baseripodowomozigemozovi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b769e27d2---21176835422.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/ritotiwuguwemixikaxivo.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/70783487585.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/26814845298.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78595773d51de46bd05639489926d046/22962110095.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210918165105.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/dipejukozeweteleza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+to+do+with+magma+cream+in+minecraftPDF 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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 17404 bytes
SHA-256: 2d3f59bf709070b35d690ac8408eeb3372f398cf5b724a5cbd43bb4274dcd6d0
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 10788 bytes
SHA-256: def01d9150771339cb80ba172e09c0bb34fe19cd69a4291978274b03460db18c

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