Malicious PDF — malware analysis report

Static analysis result for SHA-256 237584f762da8dba…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 22:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0c62ca9f8de49522032a71d70bbffce SHA-1: c5dd6875e555c86b2dd384925c14e853399f2344 SHA-256: 237584f762da8dbaf1fc5a2148716a1dca02de5e7454ce2e5f96d69b0ef55fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://knurussian.kr/DATA/upload/files/202108080545108053.pdf In PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/50223818063.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fojadapokizole.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/99640441384.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a148ad165---wiwejenerokunom.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/13231922686.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1a44d9eca---vefobatolekoma.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/81415640363.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160803f77077ce---pivokafepuguwubip.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/14848935254.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/gedevutagubegin.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e34d7420---60435329098.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/fatuvu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3e37c769---76403482772.pdfIn PDF document text
    • http://poultech.net/d/files/64701156419.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a378c0bf4e7---gumabipibefuvin.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160929b9328f4c---nevudijemoko.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/uskoflps6mo5qm0e9k49tuf5e6/87856266185.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/midodi.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/wikus.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/83772288152.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161171135e71a5---gomafa.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24562032652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=another+word+for+good+looking+manPDF 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_off0000c0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CA 16100 bytes
SHA-256: 968eb0b64711e7ca6fc34ca276709fbd3d75deb222e0cab62dff7561e9711c25
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10792 bytes
SHA-256: e32f532ece1ec08d155f987603ed4b5b55358787563643fd63fae0fc4406460c

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