Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fc783285ffa5b4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 05:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de89d3dd3aa61962758340e13008c7c5 SHA-1: b13982a7e18c016172c1708162482731639d67f8 SHA-256: 76fc783285ffa5b4278500fb41fc8190ea469f9af33a73856fab8306dddea1b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9161

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=tweaked+pokemon+go+download PDF link annotation
    • https://aglogistics-bo.net/userfiles/file/27055697494.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd2b67097d---21956236523.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/lunafagulotij.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/25690101119.pdfIn PDF document text
    • https://wsbtitan.com/images/file/19267111184.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/futivinoromevujovagomun.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/xifop.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/83383623620.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/27014540238.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/73460951226.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2ngscokn2o9ua632gbu5domhi3/noguzasatiwigosasozix.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161355da6d16b4---kolufoloterev.pdfIn PDF document text
    • http://cke.hk/userfiles/wanawu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/tugaw.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vedizadexikofuvunaxaf.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/negupirabiko.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/nujexirizurumefo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/415da1abc2f44b01faf1018083b1b212/13334756844.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/wunika.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/61940554738.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/wibojezuruxikubuneg.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/50607712116.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dff64dd1685bdc89cc74f6d43c5035ef/kedidinunagirixu.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/rafarazopurotas.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 19304 bytes
SHA-256: dfedf3ca400ef5c650f53c752e9dffa4668309c0efce17454e53e56d1f70f501

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