Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e97dcbb94e3b0d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 23:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dfe1e0b7c169965f0fd502694c155595 SHA-1: ac772b7b0e035e65185e6a6a3b65129810cde83a SHA-256: 33e97dcbb94e3b0dc431497d31317c919adfd722e98b728fbbc19f04a3414c28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=teach+yourself+german+pdf+free PDF link annotation
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20c94d9a8---vutuxubufegazibokute.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/nurowi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/71352319211.pdfIn PDF document text
    • https://avenue102.com/uploads/file/mademisisawuxivake.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/sawak.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ck9ggbf0omjtg2qe0a9u01rab2/61657486562.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/57hpb12o8mejn6dhntq2td4d4u/92351283362.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/sewoveroredasinetosiraxe.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/32143244692.pdfIn PDF document text
    • http://onelove.cz/file/44511085703.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/gedijenunetigab.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/44298641224.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/59267709584.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/kidupekagif.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/21423451201.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/jinixuwerekavabawadek.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d36359c4ee5556d897ca6aea614fd223/jupiwulomabufeworano.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/wevelesovelidagirerilevi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/41794481466.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/nutawevudibafuto.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/temubamisoz.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116969ae6d34---fimozusifaxenuxadekonij.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bae524550b3a08ed4aa1d26c85054d27/sinixevidab.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/narogetazore.pdfIn PDF document text
    • https://tpk-m.ru/files/file/darasawotafa.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758b21d204---84685762763.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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 19056 bytes
SHA-256: 465faab1fc36eeb348a0294a5d5578ab6c4d9119922d88d5dc1d26f54516d32f
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 11052 bytes
SHA-256: 38e7dd04b5cc30397181f8760b3c4761458a19c5ef8ce98d6c097126bea804e7
font_02_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1