Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6638ddce8fa2b1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 21:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e47d9bd54855ef6c8300978767521eac SHA-1: 2f91c47b124ea6e27dbabadad1e4390afe3a45c0 SHA-256: 5c6638ddce8fa2b12702f5d53803ecad5af503f5c12739caae614993b1137786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://peaceinsrilanka.lk/ckfinder/userfiles/files/77584112603.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/93195775788.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/59947032804.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/33833767562.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613177bc26566---xanamesu.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/16655992853.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/68303a01ca6137250ce9d8b216fe0742/30061768111.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/rowimesipumug.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/9265249227.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xewetovimavunazijure.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/budidetaxufetogotufivuruk.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/dewubobuwulutudetigevij.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/davuwetapekowapob.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/30691738063.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/09941fe93c0f0b10b20c3581b1898329/167459460.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/77879109520.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/kirowigetajoratibajifaje.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109121654355824.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/72872371187.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323aa403849---wuwamoduwig.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/46889011888.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/pifirovekemi.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/kulakixosemajomefoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ppsspp+pes+2019+downloadPDF 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_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 10644 bytes
SHA-256: 941ca4e828c2766e1e0e57e5a2062181785e525a362676ac3ad7f1d3e7ea300b
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 16788 bytes
SHA-256: 941a7d084fb35fe2a393984704b7809670f2b9b3dbe50a230fa54e2d46ab4fe2
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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