Malicious PDF — malware analysis report

Static analysis result for SHA-256 243b53958974f375…

MALICIOUS

PDF

84.4 KB Created: 2021-08-17 05:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef7e991ee068936da8f394a413e5ce78 SHA-1: 411c106500928e2da2cabd8219ea64ac77810eb5 SHA-256: 243b53958974f375ef285207c850534797eea195f3b31a4d87880dcbafdf4a33
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://krisoc.ru/uplcv?utm_term=monster-skillet+free+mp3+download+windows+10 PDF link annotation
    • http://babywagen24.de/userfiles/file/kadaguzedew.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/44859751875.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/38fd32d191df3e0e8b748a1f2c961d7e/dunivirasasidelikekaza.pdfIn PDF document text
    • http://technocom.pl/editor/file/fupenowoxixomajowosafi.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/silowi.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/rasaxus.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c046ced9794---jabolikejuwigarejuvetufa.pdfIn PDF document text
    • http://labsshop.com/d/files/lovababileboxaxonubutem.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/29863664121.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/34843737477.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/45101149763.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/015f36fcf48afa1790476843f46509c6/sonitisuxawavaxukopu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/17871998874.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/55666930728.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/pudiluvinekufajatejupoxar.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3pe5j4haekasjcdcpv7knml9q1/5627801511.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2ba4387c---kanefor.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/31882498694.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/61342792818.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add685264a8---bolazigisedadawa.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/fegekusagar.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/an5g5gutojk4j758705kb7sc8v/71584140653.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 17392 bytes
SHA-256: 227a592dc5f23ada47d2c469c676a576a48c73067d8ff4972ce2c92db6365998
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 11212 bytes
SHA-256: b3fee91ae901d1438c137d6ff3e3793866b9a512e1e58b4e53888d765e1e8393
font_02_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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