Malicious PDF — malware analysis report

Static analysis result for SHA-256 741052e555c61f91…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 11:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 527dcd1efa3a9fc33365f69b6f97c613 SHA-1: c1145ee5285c3573694842540a38bae8becbf803 SHA-256: 741052e555c61f91e8096c55117e00e2fa82f7b57d9336973d6381236f80a14c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, likely to distribute phishing content or malware. The embedded URLs suggest an attempt to lure users with terms like 'enlightenment now pdf free download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://ketchas.ru/uplcv?utm_term=enlightenment+now+pdf+free+download PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/45e9c42a808a9dcd21c1d20acb99469b/70675681649.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/xaroxubajiga.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/39484980758.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/36320696101.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3d953e600ba602aeff9d728521cf832d/65459975716.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11fc24ef7e---joxutefof.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611e071db4e6a---gazoxojewube.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lnammf8rduiq6olokqidait9f6/wadobaxe.pdfIn PDF document text
    • http://www.puhito.hu/uploads/65304747999.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/tilufoxubarofawaxete.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/72801542574.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/maxelidomebasejekakexe.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/50c5b30bee7e011223684057735517b7/siligunovozulemexetade.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/nutetogi.pdfIn PDF document text
    • http://medrea.ru/upload/files/zanisonulomipanazope.pdfIn PDF document text
    • http://polletnv.be/uploads/files/migafopaxuxosifab.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/majemenulateb.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67362795709.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2f8701f5fb19fa54564562fccf2f64a9/rupimejegetejojigafusap.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a9ccd777---71071361873.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3fe5eb84---59598495762.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/19701267527.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://regionalhealthprogramsww.com/images/file/3735452436.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/lojiximetasuve.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/bugizi.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_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 16188 bytes
SHA-256: df7f5f19a41b04796084d9433dbaaf782728016d86dbe1b9669727ee14ae386e
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 10848 bytes
SHA-256: 6e51b09b3176fdf0fdc43b6b5cf9d09fc5def455b04f12021481392234016fd6
font_02_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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