Malicious PDF — malware analysis report

Static analysis result for SHA-256 657668d0def42475…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 09:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2e0a3201b337faf7ed4888ccd2609c7 SHA-1: aac8c2f962378d3fe55b719abba2ca089e8de264 SHA-256: 657668d0def424753dbab006e098eaa7f5cf856af54d6cc49e3da9b18f738bf9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

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://lso-msm.fr/userfiles/file/wetulogaziwikosovevas.pdf In PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/tuzitor.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc494a467e---11254367852.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/lisudimekikinoluk.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb05c4c26---robeberijudujuval.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c8818bdc371c3bf443e684ad9e42a8b2/sezejenotogem.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/12775871729.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5e7b5211---fimakapijekugojevotekoxo.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/8702877498.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/jetiditasij.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/51020296168.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/14894515304.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/jonimoxodemer.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082931c817ca---doxatapogur.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/174dc4b69263be2fa4d896f9dfc903fc/33639794664.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/lasolomaravetu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/ramopun.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/728a853bd050dceaa4ceb5295386568a/tuzonenalerido.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/43160756382.pdfIn PDF document text
    • https://aspirans.com/files/file/nuxumejumu.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/solobipejojemirujulo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608296f5ced72---12454495028.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce811b398b---komejemelaniwosomisebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+materiality+in+auditing+pdfPDF 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_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 16324 bytes
SHA-256: cfed570f1fb7ddf86ee8105be216c7756c3c06e1f7f825eb5f0ca54520940eaa
font_02_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 11032 bytes
SHA-256: abd25d3a209ddeb8bd641b7f33b2abd065881f5f23acc7a53815d23ea7cb62d4

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