Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b69a70a5f2c861…

MALICIOUS

PDF

80.4 KB Created: 2021-08-10 15:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7da260a1058978fc572e508d5db12991 SHA-1: 9640914b35dec025170c75289f1a0cc73abd0252 SHA-256: 16b69a70a5f2c861d6a608fd11401a4e173d626c1aac7d5ff6d5266df2b13bb8
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

Heuristics 5

  • 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
  • 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://veraschwemmle.de/fckdata/file/firajipazidegoboro.pdf In PDF document text
    • https://vocembalo.ch/userfiles/file/16806190493.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5cc27cd5f7be69c162a5eac62c25a393/52737231298.pdfIn PDF document text
    • http://kingwrapcarspa.com/upload/files/97924853959.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/figavasuj.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f87eeed56ec08e5a0372136b3bda7a6f/35757037151.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/16690641020.pdfIn PDF document text
    • http://chemicalengineers.ie/images/redolujivavezalukufudugud.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/13703733747.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/8817584006.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16082e86b0ae44---labigeberib.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/23481490732.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/lirutarufosafuz.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160949e4611a39---bipef.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/42195210685.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/30130988280.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607550d5c547d---febas.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dce52a54de8---71303834807.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wemidu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9bf7cf89---gekivirarikerub.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/69ccf1858a3d9bdcfeeddc8d779b0531/deviso.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/coiuuj6k2uh9mne8bufe7n04p6/55644369747.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pohgpca416frpi7pbapmeact55/xedavokexugujazam.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/xudekasilidesoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=libro+del+maestro+desafios+matematicos+tercer+grado+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 10956 bytes
SHA-256: 7a8242ae8c57c32fd8c2b4730d32759aacf4e63c7efbdd0e9dce558c0026c8ac

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